feat: 专员 JSON 配置体系 + 配图提示词规则重构

- 新增配图提示词 JSON 规则（image_prompt.json）：封面图 + 每 500 字按字数分布
- 新增 Go 配置加载器（weixin_public_account_image_prompt_config.go）：从嵌入的 spec 目录读取 JSON 配置
- 新增 weixin_public_account 完整 spec 目录：skill.md, workflow.json, domains.json, policy.json, validators/
- 新增 pj0012 参考文件（pj0012-wechat-image-spec.md）：配图规则 + 专员 JSON 定义体系
- 产物 Tab 添加下载按钮 + 整体导出区
- 修复前端 Markdown 渲染 bug + 步骤消息分段问题

所有专员定义向 JSON 配置迁移，以 weixin_public_account 为样板。

eai_agentplatform/backend-go/internal/specialists/packages/weixin_public_account/api/spec/config/domains.json

@@ -0,0 +1,42 @@
+{
+  "description": "业务域配置。每个业务域有对应的标签和默认配置。",
+  "version": "1.0.0",
+  "domains": {
+    "AI": {
+      "label": "AI",
+      "image_domain_label": "AI 与人工智能",
+      "hotspot_sources": ["hackernews", "techcrunch", "arxiv"],
+      "default_keywords": ["大语言模型", "AI Agent", "多模态", "AIGC"]
+    },
+    "medical": {
+      "label": "医疗",
+      "image_domain_label": "医疗健康",
+      "hotspot_sources": ["medical_news_today", "statnews"],
+      "default_keywords": ["新药研发", "临床实验", "健康管理", "医疗AI"]
+    },
+    "insurance": {
+      "label": "保险",
+      "image_domain_label": "保险金融",
+      "hotspot_sources": ["reuters", "bloomberg"],
+      "default_keywords": ["健康险", "车险", "理赔", "保险科技"]
+    },
+    "hr": {
+      "label": "HR",
+      "image_domain_label": "人力资源",
+      "hotspot_sources": ["linkedin", "shrm"],
+      "default_keywords": ["招聘", "培训", "绩效考核", "薪酬福利"]
+    },
+    "legal": {
+      "label": "法务",
+      "image_domain_label": "法律合规",
+      "hotspot_sources": ["reuters", "bloomberg"],
+      "default_keywords": ["数据合规", "知识产权", "劳动法", "合同法"]
+    },
+    "general": {
+      "label": "通用",
+      "image_domain_label": "通用主题",
+      "hotspot_sources": ["google_trending", "reddit"],
+      "default_keywords": []
+    }
+  }
+}

eai_agentplatform/backend-go/internal/specialists/packages/weixin_public_account/api/spec/config/image_prompt.json

@@ -0,0 +1,54 @@
+{
+  "description": "配图提示词生成规则。配图按字数均匀分布，封面图在标题下方，其余配图按 500 字间隔放置在所属小节开始处。",
+  "version": "1.0.0",
+  "distribution": {
+    "mode": "word_count",
+    "word_count_threshold": 500,
+    "cover_image": {
+      "enabled": true,
+      "key": "cover",
+      "slot_label": "TITLE_PIC",
+      "section_label": "封面配图",
+      "position": "after_title",
+      "size": "landscape_16_9"
+    },
+    "content_images": {
+      "enabled": true,
+      "key_prefix": "section",
+      "size": "landscape_4_3",
+      "placement": "section_start",
+      "calculation": "accumulate_across_sections"
+    }
+  },
+  "prompt_template": {
+    "description": "配图提示词模板。{index} 为序号（从 1 开始），{section_title} 为小节标题，{section_summary} 为段落摘要（截断至 120 字）。",
+    "format": "chinese",
+    "min_chars": 40,
+    "max_chars": 70,
+    "template": "真实人物纪实摄影，公众号文章配图，第{index}张配图核心画面，{section_summary}，构图清晰，主体突出，电影感光影，细节丰富，高清"
+  },
+  "bracket_format": {
+    "description": "配图提示词在正文中的嵌入格式。",
+    "cover": "[TITLE_PIC: {prompt}, size: {size}]",
+    "content": "[section_{{index:02d}}: {prompt}, size: {size}]"
+  },
+  "validation": {
+    "checks": [
+      "section_mapping_completeness",
+      "required_visual_elements",
+      "prompt_length",
+      "no_forbidden_elements"
+    ],
+    "required_elements": {
+      "subject": true,
+      "scene": true,
+      "lighting": true
+    },
+    "forbidden_elements": [
+      "text_overlay",
+      "collage_style"
+    ],
+    "retry_max": 2,
+    "retry_feedback_template": "配图提示词校验失败：{failed_checks}。请重新生成全部提示词并修复问题，保持段落映射不变。"
+  }
+}

eai_agentplatform/backend-go/internal/specialists/packages/weixin_public_account/api/spec/config/policy.json

@@ -0,0 +1,39 @@
+{
+  "description": "重试和降级策略。",
+  "version": "1.0.0",
+  "retries": {
+    "default_max_retries": 2,
+    "step_overrides": {
+      "topic_recommendation": 1,
+      "title_generation": 2,
+      "outline_generation": 2,
+      "content_creation": 2,
+      "image_prompt_generation": 2,
+      "image_generation": 2,
+      "preview_export": 0,
+      "page_markdown": 0
+    },
+    "policy": {
+      "regenerate_fully": true,
+      "include_error_message_in_feedback": true,
+      "allow_partial_patch": false
+    }
+  },
+  "fallback": {
+    "mark_fallback_in_logs": true,
+    "step_overrides": {
+      "topic_recommendation": {
+        "allow_fallback": true,
+        "fallback_note": "使用关键词直接生成选题。"
+      },
+      "title_generation": {
+        "allow_fallback": true,
+        "fallback_note": "使用标题模板生成。"
+      },
+      "content_creation": {
+        "allow_fallback": false,
+        "fallback_note": "不降级，返回明确错误。"
+      }
+    }
+  }
+}

eai_agentplatform/backend-go/internal/specialists/packages/weixin_public_account/api/spec/config/prompts/image_prompt_generate.prompt.md

@@ -0,0 +1,27 @@
+# Role
+你是 `image_prompt_generate` 步骤的执行者，负责为公众号文章生成配图提示词。
+
+# Goal
+基于正文内容，按字数分布规则生成配图提示词，并将提示词以括号标记格式嵌入正文。
+
+# 配图规则
+- 封面图：标题下方 1 张，`[TITLE_PIC: 提示词, size: landscape_16_9]`
+- 正文配图：从正文开头累计字数，每 500 字生成 1 张
+- 每张配图放在所属小节（##）的开始处
+- 如果某节超过 500 字，则该节内按 500 字间隔插入多张
+- 提示词格式：`[section_{{index:02d}}: 提示词, size: landscape_4_3]`
+
+# 提示词模板
+```
+真实人物纪实摄影，公众号文章配图，第{N}张配图核心画面，{段落摘要120字}，构图清晰，主体突出，电影感光影，细节丰富，高清
+```
+
+# 约束
+- 每个提示词必须包含：主体、场景、光线
+- 每个提示词长度 40-70 个中文字
+- 禁止文字覆盖、拼贴风格
+- 段落映射必须完整（配图数 = 需要配图的小节数）
+
+# 输出
+- `image_prompts`: 配图提示词数组 [{key, section, prompt, size}]
+- `content_with_prompts`: 带括号标记的完整正文

eai_agentplatform/backend-go/internal/specialists/packages/weixin_public_account/api/spec/config/skill.md

@@ -0,0 +1,62 @@
+# 公众号创作专员技能规范
+
+## 技能标识
+- **Key**: weixin-public-account
+- **Label**: 公众号创作专员
+- **Type**: longform-writing
+
+## 目的
+完成公众号文章的端到端创作：从选题、标题、提纲、正文、配图提示词、图片生成、预览导出到分页 Markdown。
+
+## 适用场景
+- 热点选题驱动的内容创作
+- 关键词驱动的通用文章生成
+- 多业务域（AI/医疗/保险/HR/法务/通用）适配
+
+## 工作流步骤
+
+| 序号 | Step Key | 标签 | 前置条件 | 输出 |
+|------|----------|------|----------|------|
+| 0 | task_configuration | 任务配置 | — | 业务域、关键词、受众、语调等表单参数 |
+| 1 | topic_recommendation | 选题推荐 | 配置完成 | 3 个选题建议（标题 + 理由 + 热度） |
+| 2 | title_generation | 标题生成 | 有选题 | 3 个标题建议（偏点击/偏稳重/偏平衡） |
+| 3 | outline_generation | 提纲生成 | 有标题 | Markdown 提纲结构 |
+| 4 | content_creation | 正文创作 | 有提纲 | Markdown 正文（含 ## 小节标题） |
+| 5 | image_prompt_generation | 配图提示词 | 有正文 | 配图提示词 + 带标记正文 |
+| 6 | image_generation | 图片生成 | 有配图提示词 | 封面图 + 段落图 |
+| 7 | preview_export | 预览导出 | 有正文 + 图片 | 预览 MD + 预览 HTML |
+| 8 | page_markdown | 分页 Markdown | 有预览稿 | 分页 MD（含图片尺寸标注） |
+
+## 配图规则
+
+### 分布规则
+1. 标题下方生成 1 张封面图（`cover` / `TITLE_PIC`），16:9
+2. 从正文开头累计字数，每 500 字生成 1 张配图
+3. 每张配图放在其所属小节（##）的**开始处**
+4. 如果某节很长（>500 字），则该节内按 500 字间隔插入多张
+5. 如果某节不足 500 字，与下节合并累计，但不跨节重复
+
+### 提示词模板
+```
+真实人物纪实摄影，公众号文章配图，第{N}张配图核心画面，{段落摘要120字}，构图清晰，主体突出，电影感光影，细节丰富，高清
+```
+
+### 括号标记格式
+```
+[TITLE_PIC: 提示词, size: landscape_16_9]
+[section_01: 提示词, size: landscape_4_3]
+```
+
+## 业务域
+AI、医疗、保险、HR、法务、通用
+
+## 重试策略
+- 热点抓取：最多 1 次重试
+- 选题推荐：最多 1 次重试
+- 标题/提纲/正文/配图：最多 2 次重试
+- 预览/分页：0 次重试
+
+## 验证规则
+- 提纲：至少 3 个小节，每小节至少 2 个要点
+- 正文：至少 800 字，每个小节有实质性内容
+- 配图提示词：段落数 = 提示词数，每个提示词 40-70 字，必须包含主体/场景/光线

eai_agentplatform/backend-go/internal/specialists/packages/weixin_public_account/api/spec/config/validators/image_prompt.json

@@ -0,0 +1,32 @@
+{
+  "description": "配图提示词验证规则。",
+  "version": "1.0.0",
+  "step_id": "image_prompt_generation",
+  "checks": [
+    "section_mapping_completeness",
+    "required_visual_elements",
+    "prompt_length",
+    "no_forbidden_elements",
+    "bracket_format_valid"
+  ],
+  "section_mapping": {
+    "description": "配图提示词与正文段落的映射必须完整。",
+    "cover_required": true,
+    "content_images_required": true
+  },
+  "visual_elements": {
+    "required": ["subject", "scene", "lighting"],
+    "forbidden": ["text_overlay", "collage_style"]
+  },
+  "prompt_length": {
+    "min_chars": 40,
+    "max_chars": 70,
+    "count_mode": "chinese_characters"
+  },
+  "bracket_format": {
+    "cover_pattern": "^\\[TITLE_PIC: .* size: landscape_16_9\\]$",
+    "content_pattern": "^\\[section_\\d{2}: .* size: landscape_4_3\\]$"
+  },
+  "retry_feedback_template": "配图提示词校验失败：{failed_checks}。请重新生成全部提示词并修复问题。",
+  "retry_max": 2
+}

eai_agentplatform/backend-go/internal/specialists/packages/weixin_public_account/api/spec/config/workflow.json

@@ -0,0 +1,157 @@
+{
+  "description": "公众号创作工作流步骤定义。步骤按顺序执行，前一步骤完成方可进入下一步骤。",
+  "version": "1.0.0",
+  "steps": [
+    {
+      "key": "task_configuration",
+      "label": "任务配置",
+      "type": "form",
+      "order": 0,
+      "is_entry_point": true,
+      "description": "配置业务域、关键词、受众、语调等参数。"
+    },
+    {
+      "key": "topic_recommendation",
+      "label": "选题推荐",
+      "type": "ai",
+      "order": 1,
+      "preconditions": ["task_configuration"],
+      "description": "基于业务域和关键词生成 3 个选题建议。"
+    },
+    {
+      "key": "title_generation",
+      "label": "标题生成",
+      "type": "ai",
+      "order": 2,
+      "preconditions": ["topic_recommendation"],
+      "description": "基于选定选题生成 3 个标题建议（偏点击/偏稳重/偏平衡）。"
+    },
+    {
+      "key": "outline_generation",
+      "label": "提纲生成",
+      "type": "ai",
+      "order": 3,
+      "preconditions": ["title_generation"],
+      "description": "基于选定标题生成 Markdown 提纲结构。"
+    },
+    {
+      "key": "content_creation",
+      "label": "正文创作",
+      "type": "ai",
+      "order": 4,
+      "preconditions": ["outline_generation"],
+      "description": "基于选定提纲和配置参数生成正文。"
+    },
+    {
+      "key": "image_prompt_generation",
+      "label": "配图提示词",
+      "type": "ai",
+      "order": 5,
+      "preconditions": ["content_creation"],
+      "description": "基于正文按字数分布生成配图提示词，并嵌入带标记正文。"
+    },
+    {
+      "key": "image_generation",
+      "label": "图片生成",
+      "type": "external",
+      "order": 6,
+      "preconditions": ["image_prompt_generation"],
+      "description": "基于配图提示词调用外部图片生成 API。"
+    },
+    {
+      "key": "preview_export",
+      "label": "预览导出",
+      "type": "render",
+      "order": 7,
+      "preconditions": ["content_creation", "image_generation"],
+      "description": "生成预览 MD、预览 HTML 和分页 MD。"
+    },
+    {
+      "key": "page_markdown",
+      "label": "分页 Markdown",
+      "type": "render",
+      "order": 8,
+      "preconditions": ["preview_export"],
+      "description": "生成带图片尺寸标注的分页 Markdown。"
+    }
+  ],
+  "forms": {
+    "task_configuration": {
+      "fields": [
+        {
+          "key": "business_domain",
+          "label": "业务域",
+          "type": "select",
+          "required": true,
+          "options": ["AI", "医疗", "保险", "HR", "法务", "通用"]
+        },
+        {
+          "key": "keyword",
+          "label": "关键词",
+          "type": "text",
+          "required": true
+        },
+        {
+          "key": "audience",
+          "label": "目标受众",
+          "type": "text",
+          "default": "公众号读者",
+          "required": false
+        },
+        {
+          "key": "goal",
+          "label": "写作目标",
+          "type": "text",
+          "required": false
+        },
+        {
+          "key": "tone",
+          "label": "语调风格",
+          "type": "select",
+          "default": "专业但好懂",
+          "options": ["专业但好懂", "轻松有趣", "严肃权威", "故事叙述", "数据驱动"]
+        },
+        {
+          "key": "requirements",
+          "label": "特殊要求",
+          "type": "textarea",
+          "required": false
+        },
+        {
+          "key": "outline_style",
+          "label": "提纲风格",
+          "type": "select",
+          "default": "问题拆解型",
+          "options": ["问题拆解型", "对比分析型", "案例驱动型", "步骤教程型"]
+        },
+        {
+          "key": "outline_words",
+          "label": "提纲字数",
+          "type": "number",
+          "default": 800,
+          "min": 300,
+          "max": 2000,
+          "required": false
+        },
+        {
+          "key": "content_target_words",
+          "label": "正文目标字数",
+          "type": "number",
+          "default": 1400,
+          "min": 500,
+          "max": 5000,
+          "required": false
+        },
+        {
+          "key": "max_content_images",
+          "label": "最大配图数（可选，0 表示无上限）",
+          "type": "number",
+          "default": 0,
+          "min": 0,
+          "max": 20,
+          "required": false
+        }
+      ]
+    }
+  }
+}

eai_agentplatform/backend-go/internal/specialists/packages/weixin_public_account/api/weixin_public_account_image_prompt_config.go

@@ -0,0 +1,309 @@
+package weixinpublicaccountapi
+
+import (
+	"embed"
+	"encoding/json"
+	"fmt"
+	"strings"
+)
+
+//go:embed spec/config/*.json spec/config/validators/*.json spec/config/prompts/*.md
+var specConfigFS embed.FS
+
+// imagePromptConfig 从 JSON 配置文件读取的配图提示词规则。
+type imagePromptConfig struct {
+	Distribution distributionConfig `json:"distribution"`
+	PromptTemplate promptTemplateConfig `json:"prompt_template"`
+	BracketFormat  bracketFormatConfig  `json:"bracket_format"`
+	Validation     validationConfig     `json:"validation"`
+}
+
+type distributionConfig struct {
+	Mode          string              `json:"mode"`
+	WordCount     int                 `json:"word_count_threshold"`
+	CoverImage    coverImageConfig    `json:"cover_image"`
+	ContentImages contentImagesConfig `json:"content_images"`
+}
+
+type coverImageConfig struct {
+	Enabled    bool   `json:"enabled"`
+	Key        string `json:"key"`
+	SlotLabel  string `json:"slot_label"`
+	SectionLbl string `json:"section_label"`
+	Position   string `json:"position"`
+	Size       string `json:"size"`
+}
+
+type contentImagesConfig struct {
+	Enabled     bool   `json:"enabled"`
+	KeyPrefix   string `json:"key_prefix"`
+	Size        string `json:"size"`
+	Placement   string `json:"placement"`
+	Calculation string `json:"calculation"`
+}
+
+type promptTemplateConfig struct {
+	Format   string `json:"format"`
+	MinChars int    `json:"min_chars"`
+	MaxChars int    `json:"max_chars"`
+	Template string `json:"template"`
+}
+
+type bracketFormatConfig struct {
+	Cover   string `json:"cover"`
+	Content string `json:"content"`
+}
+
+type validationConfig struct {
+	Checks                 []string            `json:"checks"`
+	RequiredElements       map[string]bool     `json:"required_elements"`
+	ForbiddenElements      []string            `json:"forbidden_elements"`
+	RetryMax               int                 `json:"retry_max"`
+	RetryFeedbackTemplate  string              `json:"retry_feedback_template"`
+}
+
+// imagePromptRule 是运行时的实例化规则（含业务域标签、关键词等运行时参数）。
+type imagePromptRule struct {
+	Keyword        string
+	BusinessDomain string
+	Template       promptTemplateConfig
+	Distribution   distributionConfig
+	BracketFormat  bracketFormatConfig
+}
+
+var weixinPublicAccountImagePromptConfig *imagePromptConfig
+var weixinPublicAccountImagePromptRuleCache map[string]*imagePromptRule
+
+func init() {
+	weixinPublicAccountImagePromptConfig = loadWeixinPublicAccountImagePromptConfig()
+	weixinPublicAccountImagePromptRuleCache = make(map[string]*imagePromptRule)
+}
+
+// loadWeixinPublicAccountImagePromptConfig 从嵌入的 spec 目录加载 JSON 配置。
+func loadWeixinPublicAccountImagePromptConfig() *imagePromptConfig {
+	data, err := specConfigFS.ReadFile("spec/config/image_prompt.json")
+	if err != nil {
+		// 如果 spec 目录不存在或配置缺失，回退到内联默认配置
+		return defaultImagePromptConfig()
+	}
+	var cfg imagePromptConfig
+	if err := json.Unmarshal(data, &cfg); err != nil {
+		return defaultImagePromptConfig()
+	}
+	return &cfg
+}
+
+func defaultImagePromptConfig() *imagePromptConfig {
+	return &imagePromptConfig{
+		Distribution: distributionConfig{
+			Mode:    "word_count",
+			WordCount: 500,
+			CoverImage: coverImageConfig{
+				Enabled:    true,
+				Key:        "cover",
+				SlotLabel:  "TITLE_PIC",
+				SectionLbl: "封面配图",
+				Position:   "after_title",
+				Size:       "landscape_16_9",
+			},
+			ContentImages: contentImagesConfig{
+				Enabled:     true,
+				KeyPrefix:   "section",
+				Size:        "landscape_4_3",
+				Placement:   "section_start",
+				Calculation: "accumulate_across_sections",
+			},
+		},
+		PromptTemplate: promptTemplateConfig{
+			Format:   "chinese",
+			MinChars: 40,
+			MaxChars: 70,
+			Template: "真实人物纪实摄影，公众号文章配图，第{N}张配图核心画面，{段落摘要120字}，构图清晰，主体突出，电影感光影，细节丰富，高清",
+		},
+		BracketFormat: bracketFormatConfig{
+			Cover:   "[TITLE_PIC: {prompt}, size: {size}]",
+			Content: "[section_{{index:02d}}: {prompt}, size: {size}]",
+		},
+		Validation: validationConfig{
+			Checks: []string{
+				"section_mapping_completeness",
+				"required_visual_elements",
+				"prompt_length",
+				"no_forbidden_elements",
+			},
+			RequiredElements: map[string]bool{
+				"subject":  true,
+				"scene":    true,
+				"lighting": true,
+			},
+			ForbiddenElements: []string{
+				"text_overlay",
+				"collage_style",
+			},
+			RetryMax:  2,
+		},
+	}
+}
+
+// getWeixinPublicAccountImagePromptRule 按业务域获取缓存的规则。
+func getWeixinPublicAccountImagePromptRule(workflow *weixinPublicAccountWorkflowState) *imagePromptRule {
+	key := workflow.Form.BusinessDomain
+	if rule, ok := weixinPublicAccountImagePromptRuleCache[key]; ok {
+		return rule
+	}
+	cfg := weixinPublicAccountImagePromptConfig
+	rule := &imagePromptRule{
+		Keyword:        workflow.Form.Keyword,
+		BusinessDomain: workflow.Form.BusinessDomain,
+		Template:       cfg.PromptTemplate,
+		Distribution:   cfg.Distribution,
+		BracketFormat:  cfg.BracketFormat,
+	}
+	weixinPublicAccountImagePromptRuleCache[key] = rule
+	return rule
+}
+
+// buildWeixinPublicAccountImagePromptsV2 新版配图提示词生成逻辑，基于 JSON 配置。
+func buildWeixinPublicAccountImagePromptsV2(workflow *weixinPublicAccountWorkflowState) []weixinPublicAccountImagePrompt {
+	rule := getWeixinPublicAccountImagePromptRule(workflow)
+	cfg := &rule.Distribution
+	prompts := []weixinPublicAccountImagePrompt{}
+
+	// 1. 封面图
+	if cfg.CoverImage.Enabled {
+		prompts = append(prompts, weixinPublicAccountImagePrompt{
+			Key:     cfg.CoverImage.Key,
+			Section: cfg.CoverImage.SectionLbl,
+			Prompt:  buildCoverImagePrompt(workflow, rule),
+			Size:    cfg.CoverImage.Size,
+		})
+	}
+
+	// 2. 正文配图（按 500 字分布）
+	sections := extractWeixinPublicAccountSections(workflow.Shared.Content)
+	contentImageIndex := 1
+	wordCountAccumulator := 0
+
+	// 根据计算模式决定如何遍历
+	if cfg.ContentImages.Calculation == "accumulate_across_sections" {
+		// 从正文开头累计字数，每 500 字生成一张配图，放在小节开始处
+		for _, section := range sections {
+			sectionWordCount := countChineseWords(section.Content)
+
+			// 如果这是一个新的配图分配点
+			if sectionWordCount > 0 {
+				wordCountAccumulator += sectionWordCount
+				// 计算这之前应该有多少张配图
+				expectedImages := wordCountAccumulator / cfg.WordCount
+				// 添加配图直到达到 expectedImages
+				for wordCountAccumulator >= expectedImages*cfg.WordCount && contentImageIndex <= expectedImages {
+					prompt := buildContentImagePrompt(workflow, section, contentImageIndex, rule)
+					prompts = append(prompts, weixinPublicAccountImagePrompt{
+						Key:     fmt.Sprintf("%s_%02d", cfg.ContentImages.KeyPrefix, contentImageIndex),
+						Section: section.Title,
+						Prompt:  prompt,
+						Size:    cfg.ContentImages.Size,
+					})
+					contentImageIndex++
+				}
+			}
+		}
+	}
+
+	return prompts
+}
+
+// buildCoverImagePrompt 生成封面图提示词。
+func buildCoverImagePrompt(workflow *weixinPublicAccountWorkflowState, rule *imagePromptRule) string {
+	title := firstNonEmpty(workflow.Shared.SelectedTitle, workflow.Form.Keyword, "公众号文章")
+
+	// 从 JSON 模板构建（当前回退到硬编码模板）
+	template := rule.Template.Template
+	if template == "" {
+		// 回退到当前硬编码的英文模板
+		return fmt.Sprintf("realistic editorial illustration, Chinese business article cover, %s, focus on %s, %s, clean composition, natural lighting, brand-safe, no text, no watermark",
+			weixinPublicAccountBusinessDomainLabel(workflow.Form.BusinessDomain),
+			title,
+			"公众号封面主视觉",
+		)
+	}
+
+	return fmt.Sprintf(template, 1, title, fmt.Sprintf("%s（截断至120字）", title))
+}
+
+// buildContentImagePrompt 生成正文配图提示词。
+func buildContentImagePrompt(workflow *weixinPublicAccountWorkflowState, section weixinPublicAccountSection, index int, rule *imagePromptRule) string {
+	summary := truncateChinese(strings.Join(section.Content, " "), 120)
+
+	// 从 JSON 模板构建
+	template := rule.Template.Template
+	if template == "" {
+		// 回退到当前硬编码的英文模板
+		return fmt.Sprintf("realistic editorial illustration, Chinese business article cover, %s, focus on %s, %s, clean composition, natural lighting, brand-safe, no text, no watermark",
+			weixinPublicAccountBusinessDomainLabel(workflow.Form.BusinessDomain),
+			firstNonEmpty(section.Title, workflow.Form.Keyword),
+			firstNonEmpty(summary, workflow.Form.Tone),
+		)
+	}
+
+	return fmt.Sprintf(template, index, firstNonEmpty(section.Title, workflow.Form.Keyword), summary)
+}
+
+// countChineseWords 计算内容的中文字数。
+func countChineseWords(content []string) int {
+	text := strings.Join(content, "\n")
+	count := 0
+	for _, r := range text {
+		if r >= '\u4e00' && r <= '\u9fff' {
+			count++
+		}
+	}
+	return count
+}
+
+// truncateChinese 截断中文字符串到指定长度。
+func truncateChinese(s string, maxLen int) string {
+	runes := []rune(s)
+	if len(runes) > maxLen {
+		return string(runes[:maxLen])
+	}
+	return s
+}
+
+// renderWeixinPublicAccountImagePromptFromJSON 基于 JSON 配置渲染带标记的正文。
+func renderWeixinPublicAccountImagePromptFromJSON(content string, prompts []weixinPublicAccountImagePrompt) string {
+	cfg := weixinPublicAccountImagePromptConfig
+	content = strings.TrimSpace(content)
+	if content == "" {
+		return ""
+	}
+	blocks := []string{content, "", "## 配图提示词"}
+
+	// 使用 JSON 配置中的括号格式
+	sections := extractWeixinPublicAccountSections(content)
+	sectionIdx := 0
+
+	for _, prompt := range prompts {
+		if prompt.Key == cfg.Distribution.CoverImage.Key {
+			// 封面图：插入在标题下方
+			block := replacePlaceholder(cfg.BracketFormat.Cover, "{prompt}", prompt.Prompt)
+			block = replacePlaceholder(block, "{size}", cfg.Distribution.CoverImage.Size)
+			blocks = append(blocks, block)
+		} else if strings.HasPrefix(prompt.Key, cfg.Distribution.ContentImages.KeyPrefix) {
+			// 正文配图：插入在小节开始处
+			if sectionIdx < len(sections) {
+				block := replacePlaceholder(cfg.BracketFormat.Content, "{prompt}", prompt.Prompt)
+				block = replacePlaceholder(block, "{size}", cfg.Distribution.ContentImages.Size)
+				block = replacePlaceholder(block, "{index}", fmt.Sprintf("%02d", sectionIdx+1))
+				blocks = append(blocks, block)
+			}
+			sectionIdx++
+		}
+	}
+
+	return strings.Join(blocks, "\n")
+}
+
+func replacePlaceholder(s, placeholder, value string) string {
+	return strings.ReplaceAll(s, placeholder, value)
+}

eai_agentplatform/backend-go/internal/specialists/packages/weixin_public_account/api/weixin_public_account_workflow.go

@@ -153,6 +153,7 @@ type weixinPublicAccountImagePrompt struct {
 	Key     string `json:"key"`
 	Section string `json:"section"`
 	Prompt  string `json:"prompt"`
+	Size    string `json:"size"`
 }
 
 type weixinPublicAccountImageRef struct {

eai_agentplatform/backend-go/internal/specialists/packages/weixin_public_account/spec/README.md

@@ -0,0 +1,60 @@
+# 公众号创作专员 - 规范定义
+
+> 这是 pj0235 的第一个"配置驱动"专员样板。参考 pj0012 的 JSON 配置体系设计。
+
+## 目录结构
+
+```
+spec/
+├── config/
+│   ├── skill.md                  # 技能描述 + 执行策略（人可读 + LLM 可读）
+│   ├── workflow.json             # 工作流步骤定义（步骤 key、标签、前置条件、表单）
+│   ├── image_prompt.json         # 配图提示词规则（分布、模板、验证）
+│   ├── domains.json              # 业务域配置
+│   └── policy.json               # 重试和降级策略
+├── config/prompts/
+│   └── image_prompt_generate.prompt.md  # 配图提示词生成 prompt 模板
+├── config/validators/
+│   └── image_prompt.json         # 配图提示词验证规则
+└── README.md
+```
+
+## 设计原则
+
+1. **三层分离**：
+   - `skill.md` — 技能描述层（人可读 + LLM 可读）
+   - `*.json` — 数据配置层（机器可读，热更新）
+   - `*.prompt.md` — 提示词模板层（YAML 变量注入）
+
+2. **代码是运行时适配器**：
+   - 按路径读取 JSON/文本
+   - 将运行时参数注入模板
+   - 执行验证器逻辑
+   - 控制重试/降级循环
+   - 调用 LLM
+
+3. **不硬编码业务内容**：
+   - 业务规则变更通过修改 JSON/Markdown 实现
+   - 代码层只做通用适配
+
+## 配图规则（核心示例）
+
+配图提示词规则完全外置在 `image_prompt.json` 中，包括：
+
+- 分布规则：封面图 + 每 500 字 1 张
+- 提示词模板：中文模板 + 最小/最大字数
+- 括号标记格式：`[TITLE_PIC: 提示词, size: landscape_16_9]`
+- 验证规则：主体/场景/光线必填，文字覆盖/拼贴禁用
+- 重试策略：最多 2 次
+
+## 如何参考
+
+完整的学习分析见：`../../../../reference/pj0012-wechat-image-spec.md`
+
+## 使用方式
+
+Go 代码通过 `embed.FS` 嵌入这些文件，运行时：
+1. 读取 JSON 配置 → 获取业务规则
+2. 读取 prompt 模板 → 注入运行时参数 → 组装最终 prompt
+3. 读取验证器 → 执行验证逻辑
+4. 读取策略 → 控制重试/降级循环

eai_agentplatform/backend-go/internal/specialists/packages/weixin_public_account/spec/config/domains.json

@@ -0,0 +1,42 @@
+{
+  "description": "业务域配置。每个业务域有对应的标签和默认配置。",
+  "version": "1.0.0",
+  "domains": {
+    "AI": {
+      "label": "AI",
+      "image_domain_label": "AI 与人工智能",
+      "hotspot_sources": ["hackernews", "techcrunch", "arxiv"],
+      "default_keywords": ["大语言模型", "AI Agent", "多模态", "AIGC"]
+    },
+    "medical": {
+      "label": "医疗",
+      "image_domain_label": "医疗健康",
+      "hotspot_sources": ["medical_news_today", "statnews"],
+      "default_keywords": ["新药研发", "临床实验", "健康管理", "医疗AI"]
+    },
+    "insurance": {
+      "label": "保险",
+      "image_domain_label": "保险金融",
+      "hotspot_sources": ["reuters", "bloomberg"],
+      "default_keywords": ["健康险", "车险", "理赔", "保险科技"]
+    },
+    "hr": {
+      "label": "HR",
+      "image_domain_label": "人力资源",
+      "hotspot_sources": ["linkedin", "shrm"],
+      "default_keywords": ["招聘", "培训", "绩效考核", "薪酬福利"]
+    },
+    "legal": {
+      "label": "法务",
+      "image_domain_label": "法律合规",
+      "hotspot_sources": ["reuters", "bloomberg"],
+      "default_keywords": ["数据合规", "知识产权", "劳动法", "合同法"]
+    },
+    "general": {
+      "label": "通用",
+      "image_domain_label": "通用主题",
+      "hotspot_sources": ["google_trending", "reddit"],
+      "default_keywords": []
+    }
+  }
+}

eai_agentplatform/backend-go/internal/specialists/packages/weixin_public_account/spec/config/image_prompt.json

@@ -0,0 +1,54 @@
+{
+  "description": "配图提示词生成规则。配图按字数均匀分布，封面图在标题下方，其余配图按 500 字间隔放置在所属小节开始处。",
+  "version": "1.0.0",
+  "distribution": {
+    "mode": "word_count",
+    "word_count_threshold": 500,
+    "cover_image": {
+      "enabled": true,
+      "key": "cover",
+      "slot_label": "TITLE_PIC",
+      "section_label": "封面配图",
+      "position": "after_title",
+      "size": "landscape_16_9"
+    },
+    "content_images": {
+      "enabled": true,
+      "key_prefix": "section",
+      "size": "landscape_4_3",
+      "placement": "section_start",
+      "calculation": "accumulate_across_sections"
+    }
+  },
+  "prompt_template": {
+    "description": "配图提示词模板。{index} 为序号（从 1 开始），{section_title} 为小节标题，{section_summary} 为段落摘要（截断至 120 字）。",
+    "format": "chinese",
+    "min_chars": 40,
+    "max_chars": 70,
+    "template": "真实人物纪实摄影，公众号文章配图，第{index}张配图核心画面，{section_summary}，构图清晰，主体突出，电影感光影，细节丰富，高清"
+  },
+  "bracket_format": {
+    "description": "配图提示词在正文中的嵌入格式。",
+    "cover": "[TITLE_PIC: {prompt}, size: {size}]",
+    "content": "[section_{{index:02d}}: {prompt}, size: {size}]"
+  },
+  "validation": {
+    "checks": [
+      "section_mapping_completeness",
+      "required_visual_elements",
+      "prompt_length",
+      "no_forbidden_elements"
+    ],
+    "required_elements": {
+      "subject": true,
+      "scene": true,
+      "lighting": true
+    },
+    "forbidden_elements": [
+      "text_overlay",
+      "collage_style"
+    ],
+    "retry_max": 2,
+    "retry_feedback_template": "配图提示词校验失败：{failed_checks}。请重新生成全部提示词并修复问题，保持段落映射不变。"
+  }
+}

eai_agentplatform/backend-go/internal/specialists/packages/weixin_public_account/spec/config/policy.json

@@ -0,0 +1,39 @@
+{
+  "description": "重试和降级策略。",
+  "version": "1.0.0",
+  "retries": {
+    "default_max_retries": 2,
+    "step_overrides": {
+      "topic_recommendation": 1,
+      "title_generation": 2,
+      "outline_generation": 2,
+      "content_creation": 2,
+      "image_prompt_generation": 2,
+      "image_generation": 2,
+      "preview_export": 0,
+      "page_markdown": 0
+    },
+    "policy": {
+      "regenerate_fully": true,
+      "include_error_message_in_feedback": true,
+      "allow_partial_patch": false
+    }
+  },
+  "fallback": {
+    "mark_fallback_in_logs": true,
+    "step_overrides": {
+      "topic_recommendation": {
+        "allow_fallback": true,
+        "fallback_note": "使用关键词直接生成选题。"
+      },
+      "title_generation": {
+        "allow_fallback": true,
+        "fallback_note": "使用标题模板生成。"
+      },
+      "content_creation": {
+        "allow_fallback": false,
+        "fallback_note": "不降级，返回明确错误。"
+      }
+    }
+  }
+}

eai_agentplatform/backend-go/internal/specialists/packages/weixin_public_account/spec/config/prompts/image_prompt_generate.prompt.md

@@ -0,0 +1,27 @@
+# Role
+你是 `image_prompt_generate` 步骤的执行者，负责为公众号文章生成配图提示词。
+
+# Goal
+基于正文内容，按字数分布规则生成配图提示词，并将提示词以括号标记格式嵌入正文。
+
+# 配图规则
+- 封面图：标题下方 1 张，`[TITLE_PIC: 提示词, size: landscape_16_9]`
+- 正文配图：从正文开头累计字数，每 500 字生成 1 张
+- 每张配图放在所属小节（##）的开始处
+- 如果某节超过 500 字，则该节内按 500 字间隔插入多张
+- 提示词格式：`[section_{{index:02d}}: 提示词, size: landscape_4_3]`
+
+# 提示词模板
+```
+真实人物纪实摄影，公众号文章配图，第{N}张配图核心画面，{段落摘要120字}，构图清晰，主体突出，电影感光影，细节丰富，高清
+```
+
+# 约束
+- 每个提示词必须包含：主体、场景、光线
+- 每个提示词长度 40-70 个中文字
+- 禁止文字覆盖、拼贴风格
+- 段落映射必须完整（配图数 = 需要配图的小节数）
+
+# 输出
+- `image_prompts`: 配图提示词数组 [{key, section, prompt, size}]
+- `content_with_prompts`: 带括号标记的完整正文

eai_agentplatform/backend-go/internal/specialists/packages/weixin_public_account/spec/config/skill.md

@@ -0,0 +1,62 @@
+# 公众号创作专员技能规范
+
+## 技能标识
+- **Key**: weixin-public-account
+- **Label**: 公众号创作专员
+- **Type**: longform-writing
+
+## 目的
+完成公众号文章的端到端创作：从选题、标题、提纲、正文、配图提示词、图片生成、预览导出到分页 Markdown。
+
+## 适用场景
+- 热点选题驱动的内容创作
+- 关键词驱动的通用文章生成
+- 多业务域（AI/医疗/保险/HR/法务/通用）适配
+
+## 工作流步骤
+
+| 序号 | Step Key | 标签 | 前置条件 | 输出 |
+|------|----------|------|----------|------|
+| 0 | task_configuration | 任务配置 | — | 业务域、关键词、受众、语调等表单参数 |
+| 1 | topic_recommendation | 选题推荐 | 配置完成 | 3 个选题建议（标题 + 理由 + 热度） |
+| 2 | title_generation | 标题生成 | 有选题 | 3 个标题建议（偏点击/偏稳重/偏平衡） |
+| 3 | outline_generation | 提纲生成 | 有标题 | Markdown 提纲结构 |
+| 4 | content_creation | 正文创作 | 有提纲 | Markdown 正文（含 ## 小节标题） |
+| 5 | image_prompt_generation | 配图提示词 | 有正文 | 配图提示词 + 带标记正文 |
+| 6 | image_generation | 图片生成 | 有配图提示词 | 封面图 + 段落图 |
+| 7 | preview_export | 预览导出 | 有正文 + 图片 | 预览 MD + 预览 HTML |
+| 8 | page_markdown | 分页 Markdown | 有预览稿 | 分页 MD（含图片尺寸标注） |
+
+## 配图规则
+
+### 分布规则
+1. 标题下方生成 1 张封面图（`cover` / `TITLE_PIC`），16:9
+2. 从正文开头累计字数，每 500 字生成 1 张配图
+3. 每张配图放在其所属小节（##）的**开始处**
+4. 如果某节很长（>500 字），则该节内按 500 字间隔插入多张
+5. 如果某节不足 500 字，与下节合并累计，但不跨节重复
+
+### 提示词模板
+```
+真实人物纪实摄影，公众号文章配图，第{N}张配图核心画面，{段落摘要120字}，构图清晰，主体突出，电影感光影，细节丰富，高清
+```
+
+### 括号标记格式
+```
+[TITLE_PIC: 提示词, size: landscape_16_9]
+[section_01: 提示词, size: landscape_4_3]
+```
+
+## 业务域
+AI、医疗、保险、HR、法务、通用
+
+## 重试策略
+- 热点抓取：最多 1 次重试
+- 选题推荐：最多 1 次重试
+- 标题/提纲/正文/配图：最多 2 次重试
+- 预览/分页：0 次重试
+
+## 验证规则
+- 提纲：至少 3 个小节，每小节至少 2 个要点
+- 正文：至少 800 字，每个小节有实质性内容
+- 配图提示词：段落数 = 提示词数，每个提示词 40-70 字，必须包含主体/场景/光线

eai_agentplatform/backend-go/internal/specialists/packages/weixin_public_account/spec/config/validators/image_prompt.json

@@ -0,0 +1,32 @@
+{
+  "description": "配图提示词验证规则。",
+  "version": "1.0.0",
+  "step_id": "image_prompt_generation",
+  "checks": [
+    "section_mapping_completeness",
+    "required_visual_elements",
+    "prompt_length",
+    "no_forbidden_elements",
+    "bracket_format_valid"
+  ],
+  "section_mapping": {
+    "description": "配图提示词与正文段落的映射必须完整。",
+    "cover_required": true,
+    "content_images_required": true
+  },
+  "visual_elements": {
+    "required": ["subject", "scene", "lighting"],
+    "forbidden": ["text_overlay", "collage_style"]
+  },
+  "prompt_length": {
+    "min_chars": 40,
+    "max_chars": 70,
+    "count_mode": "chinese_characters"
+  },
+  "bracket_format": {
+    "cover_pattern": "^\\[TITLE_PIC: .* size: landscape_16_9\\]$",
+    "content_pattern": "^\\[section_\\d{2}: .* size: landscape_4_3\\]$"
+  },
+  "retry_feedback_template": "配图提示词校验失败：{failed_checks}。请重新生成全部提示词并修复问题。",
+  "retry_max": 2
+}

eai_agentplatform/backend-go/internal/specialists/packages/weixin_public_account/spec/config/workflow.json

@@ -0,0 +1,157 @@
+{
+  "description": "公众号创作工作流步骤定义。步骤按顺序执行，前一步骤完成方可进入下一步骤。",
+  "version": "1.0.0",
+  "steps": [
+    {
+      "key": "task_configuration",
+      "label": "任务配置",
+      "type": "form",
+      "order": 0,
+      "is_entry_point": true,
+      "description": "配置业务域、关键词、受众、语调等参数。"
+    },
+    {
+      "key": "topic_recommendation",
+      "label": "选题推荐",
+      "type": "ai",
+      "order": 1,
+      "preconditions": ["task_configuration"],
+      "description": "基于业务域和关键词生成 3 个选题建议。"
+    },
+    {
+      "key": "title_generation",
+      "label": "标题生成",
+      "type": "ai",
+      "order": 2,
+      "preconditions": ["topic_recommendation"],
+      "description": "基于选定选题生成 3 个标题建议（偏点击/偏稳重/偏平衡）。"
+    },
+    {
+      "key": "outline_generation",
+      "label": "提纲生成",
+      "type": "ai",
+      "order": 3,
+      "preconditions": ["title_generation"],
+      "description": "基于选定标题生成 Markdown 提纲结构。"
+    },
+    {
+      "key": "content_creation",
+      "label": "正文创作",
+      "type": "ai",
+      "order": 4,
+      "preconditions": ["outline_generation"],
+      "description": "基于选定提纲和配置参数生成正文。"
+    },
+    {
+      "key": "image_prompt_generation",
+      "label": "配图提示词",
+      "type": "ai",
+      "order": 5,
+      "preconditions": ["content_creation"],
+      "description": "基于正文按字数分布生成配图提示词，并嵌入带标记正文。"
+    },
+    {
+      "key": "image_generation",
+      "label": "图片生成",
+      "type": "external",
+      "order": 6,
+      "preconditions": ["image_prompt_generation"],
+      "description": "基于配图提示词调用外部图片生成 API。"
+    },
+    {
+      "key": "preview_export",
+      "label": "预览导出",
+      "type": "render",
+      "order": 7,
+      "preconditions": ["content_creation", "image_generation"],
+      "description": "生成预览 MD、预览 HTML 和分页 MD。"
+    },
+    {
+      "key": "page_markdown",
+      "label": "分页 Markdown",
+      "type": "render",
+      "order": 8,
+      "preconditions": ["preview_export"],
+      "description": "生成带图片尺寸标注的分页 Markdown。"
+    }
+  ],
+  "forms": {
+    "task_configuration": {
+      "fields": [
+        {
+          "key": "business_domain",
+          "label": "业务域",
+          "type": "select",
+          "required": true,
+          "options": ["AI", "医疗", "保险", "HR", "法务", "通用"]
+        },
+        {
+          "key": "keyword",
+          "label": "关键词",
+          "type": "text",
+          "required": true
+        },
+        {
+          "key": "audience",
+          "label": "目标受众",
+          "type": "text",
+          "default": "公众号读者",
+          "required": false
+        },
+        {
+          "key": "goal",
+          "label": "写作目标",
+          "type": "text",
+          "required": false
+        },
+        {
+          "key": "tone",
+          "label": "语调风格",
+          "type": "select",
+          "default": "专业但好懂",
+          "options": ["专业但好懂", "轻松有趣", "严肃权威", "故事叙述", "数据驱动"]
+        },
+        {
+          "key": "requirements",
+          "label": "特殊要求",
+          "type": "textarea",
+          "required": false
+        },
+        {
+          "key": "outline_style",
+          "label": "提纲风格",
+          "type": "select",
+          "default": "问题拆解型",
+          "options": ["问题拆解型", "对比分析型", "案例驱动型", "步骤教程型"]
+        },
+        {
+          "key": "outline_words",
+          "label": "提纲字数",
+          "type": "number",
+          "default": 800,
+          "min": 300,
+          "max": 2000,
+          "required": false
+        },
+        {
+          "key": "content_target_words",
+          "label": "正文目标字数",
+          "type": "number",
+          "default": 1400,
+          "min": 500,
+          "max": 5000,
+          "required": false
+        },
+        {
+          "key": "max_content_images",
+          "label": "最大配图数（可选，0 表示无上限）",
+          "type": "number",
+          "default": 0,
+          "min": 0,
+          "max": 20,
+          "required": false
+        }
+      ]
+    }
+  }
+}

eai_agentplatform/frontend/src/components/chat/WeixinPublicAccountSpecialistPanel.vue

@@ -158,9 +158,9 @@
                     class="oa-btn oa-btn-tiny"
                     type="button"
                     :disabled="previewLoading"
-                    @click="openArtifactPreview(file)"
+                    @click="downloadFile(file)"
                   >
-                    预览
+                    下载
                   </button>
                 </div>
               </div>
@@ -169,6 +169,50 @@
             </template>
           </div>
         </section>
+
+        <!-- 整体导出区：所有格式一次导出 -->
+        <section class="oa-stack-section">
+          <div class="oa-stack-head">
+            <span class="oa-stack-title">整体导出</span>
+          </div>
+          <div v-if="hasTask" class="oa-export-row">
+            <button
+              class="oa-btn"
+              type="button"
+              :disabled="loading"
+              @click="download('preview_md')"
+            >
+              预览 MD
+            </button>
+            <button
+              class="oa-btn"
+              type="button"
+              :disabled="loading"
+              @click="download('preview_html')"
+            >
+              预览 HTML
+            </button>
+            <button
+              class="oa-btn"
+              type="button"
+              :disabled="loading"
+              @click="download('pagemd')"
+            >
+              分页 MD
+            </button>
+            <button
+              class="oa-btn"
+              type="button"
+              :disabled="loading"
+              @click="download('docx')"
+            >
+              Word (.docx)
+            </button>
+          </div>
+          <div v-else class="oa-empty oa-empty-inline">
+            没有可导出的内容，先运行创作流程。
+          </div>
+        </section>
       </template>
 
       <template v-else>
@@ -1085,6 +1129,40 @@ async function download(format) {
   }
 }
 
+// 从产物文件下载（HTML / MD 直接下载，图片通过 API 获取）
+async function downloadFile(file) {
+  loading.value = true
+  try {
+    let blob = null
+    let filename = file.name || 'download'
+
+    if (file.kind === 'html' && file.html) {
+      blob = new Blob([file.html], { type: 'text/html' })
+    } else if (file.kind === 'markdown' && file.text) {
+      blob = new Blob([file.text], { type: 'text/markdown' })
+    } else if (file.kind === 'image' && file.url) {
+      blob = await fetchWeixinPublicAccountGeneratedImage(file.url)
+      if (file.name) filename = file.name
+    }
+
+    if (blob) {
+      const url = URL.createObjectURL(blob)
+      const a = document.createElement('a')
+      a.href = url
+      a.download = filename
+      document.body.appendChild(a)
+      a.click()
+      document.body.removeChild(a)
+      URL.revokeObjectURL(url)
+      ElMessage.success('下载成功')
+    }
+  } catch (error) {
+    ElMessage.error(error?.message || '下载失败')
+  } finally {
+    loading.value = false
+  }
+}
+
 function exportFileName(format) {
   if (format === 'preview_html') return 'weixin-public-account-preview.html'
   if (format === 'pagemd') return 'weixin-public-account-pagemd.md'

eai_agentplatform/frontend/src/views/workbench/SmartAssistantPage.vue

@@ -474,7 +474,13 @@ function renderMarkdownBlock(block) {
   const headingMatch = trimmed.match(/^(#{1,3})\s+(.+)$/)
   if (headingMatch) {
     const level = headingMatch[1].length
-    return `<h${level}>${renderInlineMarkdown(headingMatch[2])}</h${level}>`
+    const heading = `<h${level}>${renderInlineMarkdown(headingMatch[2])}</h${level}>`
+    // If the block has more lines after the heading, render them as additional content
+    const afterHeading = trimmed.split('\n', 2)[1]
+    if (afterHeading && afterHeading.trim()) {
+      return heading + ' ' + renderMarkdownBlock(afterHeading.trim())
+    }
+    return heading
   }
 
   const lines = trimmed.split('\n')
@@ -792,7 +798,7 @@ function getWeixinPublicAccountStep(payload, stepKey) {
   return payload?.workflow?.steps?.[stepKey] || {}
 }
 
-function trimWeixinPublicAccountText(value, maxLength = 180) {
+function trimWeixinPublicAccountText(value, maxLength = 360) {
   const text = String(value || '').trim()
   if (!text) return ''
   return text.length > maxLength ? `${text.slice(0, maxLength).trim()}...` : text
@@ -876,7 +882,7 @@ function buildWeixinPublicAccountOutlineStageMessage(payload) {
       '### 3. 提纲步骤已完成',
       sections.length
         ? `本轮提纲主结构：\n${formatWeixinPublicAccountBulletList(sections)}`
-        : trimWeixinPublicAccountText(outline, 220) || '本轮提纲已生成。',
+        : trimWeixinPublicAccountText(outline, 500) || '本轮提纲已生成。',
     ].filter(Boolean).join('\n\n'),
     timestamp: new Date().toLocaleTimeString(),
   }
@@ -892,7 +898,7 @@ function buildWeixinPublicAccountContentStageMessage(payload) {
       .replace(/^>\s+.*$/gm, '')
       .replace(/\n{2,}/g, '\n')
       .trim(),
-    220,
+    500,
   )
   return {
     role: 'assistant',
@@ -910,15 +916,18 @@ function buildWeixinPublicAccountImagePromptStageMessage(payload) {
   const output = step.output || {}
   const count = Number(output.count || 0)
   const prompts = Array.isArray(output.image_prompts) ? output.image_prompts.slice(0, 4) : []
+  const lines = [
+    `已提炼 ${count} 条配图提示词。`,
+    ...(prompts.length
+      ? prompts.map((item, index) => `${index + 1}. [${item?.section || '段落配图'}] ${trimWeixinPublicAccountText(item?.prompt || '', 80)}`)
+      : []),
+  ]
   return {
     role: 'assistant',
     content: [
       '### 5. 配图提示词步骤已完成',
-      count > 0 ? `已提炼 ${count} 条配图提示词。` : '本轮未提炼出可用配图提示词。',
-      ...(prompts.length
-        ? prompts.map((item, index) => `${index + 1}. [${item?.section || '段落配图'}] ${trimWeixinPublicAccountText(item?.prompt || '', 80)}`)
-        : []),
-    ].filter(Boolean).join('\n'),
+      lines.length ? lines.join('\n') : '本轮未提炼出可用配图提示词。',
+    ].filter(Boolean).join('\n\n'),
     timestamp: new Date().toLocaleTimeString(),
   }
 }
@@ -929,15 +938,18 @@ function buildWeixinPublicAccountImageGenerationStageMessage(payload) {
   const output = step.output || {}
   const count = Number(output.count || 0)
   const refs = Array.isArray(output.image_refs) ? output.image_refs.slice(0, 4) : []
+  const lines = [
+    `已生成 ${count} 张配图。`,
+    ...(refs.length
+      ? refs.map((item, index) => `${index + 1}. [${item?.section || '段落配图'}] ${trimWeixinPublicAccountText(item?.prompt || '', 60)}`)
+      : []),
+  ]
   return {
     role: 'assistant',
     content: [
       '### 6. 图片生成步骤已完成',
-      count > 0 ? `已生成 ${count} 张配图。` : '本轮未生成图片结果。',
-      ...(refs.length
-        ? refs.map((item, index) => `${index + 1}. [${item?.section || '段落配图'}] ${trimWeixinPublicAccountText(item?.prompt || '', 60)}`)
-        : []),
-    ].filter(Boolean).join('\n'),
+      lines.length ? lines.join('\n') : '本轮未生成图片结果。',
+    ].filter(Boolean).join('\n\n'),
     timestamp: new Date().toLocaleTimeString(),
   }
 }
@@ -952,7 +964,7 @@ function buildWeixinPublicAccountPreviewStageMessage(payload) {
     content: [
       '### 7. 预览与导出步骤已完成',
       `已整合正文${imageCount ? `与 ${imageCount} 张配图` : ''}生成预览稿，可检查排版并导出。`,
-    ].filter(Boolean).join('\n'),
+    ].filter(Boolean).join('\n\n'),
     timestamp: new Date().toLocaleTimeString(),
   }
 }
@@ -967,7 +979,7 @@ function buildWeixinPublicAccountPageMarkdownStageMessage(payload) {
     content: [
       '### 8. 分页 MD 步骤已完成',
       count > 0 ? `已按段落结构生成 ${count} 页分页 MD。` : '分页 MD 已生成。',
-    ].filter(Boolean).join('\n'),
+    ].filter(Boolean).join('\n\n'),
     timestamp: new Date().toLocaleTimeString(),
   }
 }