feat: 微信公众号技能包重命名(weixin_public_account)并增强功能

- 将 wechat_official_account 重命名为 weixin_public_account，符合中文命名规范
- 新增 DOCX 文档生成技能、聊天历史、请求 ID 中间件
- 增强工作流、热点服务、文章服务等模块功能
- 前端同步重命名组件和 API
- 新增架构文档 AR13/AR14、专员文档更新
- 补充测试用例(seed_specialists_test, db_migration_test)

Co-Authored-AI: yes

eai_agentplatform/backend-go/internal/ai/llm.go

@@ -50,15 +50,22 @@ type Client struct {
 	hc          *http.Client
 }
 
+// defaultHTTPTimeout 默认 HTTP 整体超时；路由可用 timeout_seconds 单独覆盖
+const defaultHTTPTimeout = 60 * time.Second
+
 // NewClient 从 RouteConfig 创建客户端
 func NewClient(aiRoute *config.RouteConfig) *Client {
+	timeout := defaultHTTPTimeout
+	if aiRoute.TimeoutSeconds > 0 {
+		timeout = time.Duration(aiRoute.TimeoutSeconds) * time.Second
+	}
 	return &Client{
 		baseURL:     strings.TrimRight(aiRoute.BaseURL, "/"),
 		apiKey:      aiRoute.APIKey,
 		model:       aiRoute.Model,
 		maxTokens:   aiRoute.MaxTokens,
 		temperature: aiRoute.Temperature,
-		hc:          &http.Client{Timeout: 120 * time.Second},
+		hc:          &http.Client{Timeout: timeout},
 	}
 }
 
@@ -215,32 +222,60 @@ func (c *Client) GenerateStream(messages []Message, onChunk func(string)) error
 		return fmt.Errorf("LLM 返回 %d: %s", resp.StatusCode, truncate(string(data), 200))
 	}
 
+	// 流式空闲超时保护：若超过 idleTimeout 没有收到任何可消费 chunk，
+	// 判定为卡死并返回错误，避免前端无限等待（此前本地模型卡顿时会干等 120s）。
+	const idleTimeout = 45 * time.Second
+
 	scanner := bufio.NewScanner(resp.Body)
 	scanner.Buffer(make([]byte, 64*1024), 1024*1024)
-	for scanner.Scan() {
-		line := scanner.Text()
-		if !strings.HasPrefix(line, "data:") {
-			continue
+	scannerCh := make(chan string, 1)
+	// 驱动 scanner 的 goroutine，配合 select 实现空闲超时。
+	// 函数返回时 defer resp.Body.Close() 会让 scanner.Scan() 立即返回，
+	// goroutine 随之退出并通过 close 通知主循环（缓冲 channel 避免阻塞发送）。
+	go func() {
+		for scanner.Scan() {
+			scannerCh <- scanner.Text()
 		}
-		payload := strings.TrimSpace(strings.TrimPrefix(line, "data:"))
-		if payload == "[DONE]" {
-			break
-		}
-		var chunk struct {
-			Choices []struct {
-				Delta struct {
-					Content string `json:"content"`
-				} `json:"delta"`
-			} `json:"choices"`
-		}
-		if err := json.Unmarshal([]byte(payload), &chunk); err != nil {
-			continue
-		}
-		if len(chunk.Choices) > 0 && chunk.Choices[0].Delta.Content != "" {
-			onChunk(chunk.Choices[0].Delta.Content)
+		close(scannerCh)
+	}()
+
+	idleTimer := time.NewTimer(idleTimeout)
+	defer idleTimer.Stop()
+	for {
+		select {
+		case <-idleTimer.C:
+			return fmt.Errorf("LLM 流式响应空闲超时（%s 内无数据）", idleTimeout)
+		case line, ok := <-scannerCh:
+			if !ok {
+				return nil
+			}
+			if !strings.HasPrefix(line, "data:") {
+				continue
+			}
+			payload := strings.TrimSpace(strings.TrimPrefix(line, "data:"))
+			if payload == "[DONE]" {
+				return nil
+			}
+			var chunk struct {
+				Choices []struct {
+					Delta struct {
+						Content string `json:"content"`
+					} `json:"delta"`
+				} `json:"choices"`
+			}
+			if err := json.Unmarshal([]byte(payload), &chunk); err != nil {
+				continue
+			}
+			if len(chunk.Choices) > 0 && chunk.Choices[0].Delta.Content != "" {
+				// 收到有效内容，重置空闲计时
+				if !idleTimer.Stop() {
+					<-idleTimer.C
+				}
+				idleTimer.Reset(idleTimeout)
+				onChunk(chunk.Choices[0].Delta.Content)
+			}
 		}
 	}
-	return scanner.Err()
 }
 
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