feat: 新增语音转文字（ASR）功能

- 后端：新增 /api/audio/transcribe 接口，调用 Ollama whisper 进行语音识别
- 前端：新增 AudioTranscribePage.vue 页面，支持 MP3/WAV/M4A/OGG/FLAC 等格式
- 注册路由、工具卡片、智能助手欢迎语更新

Co-Authored-By: Claude Code <noreply@anthropic.com>

eai_agentplatform/backend-go/internal/api/courses.go

@@ -0,0 +1,169 @@
+package api
+
+import (
+	"strconv"
+
+	"github.com/gin-gonic/gin"
+
+	"eai_agentplatform/backend/internal/model"
+	"eai_agentplatform/backend/internal/store"
+	"eai_agentplatform/backend/internal/web"
+)
+
+// courseView 课程详情视图（含绑定产品）
+func courseView(c *gin.Context, co model.Course) {
+	out := gin.H{
+		"id":                  co.ID,
+		"code":                co.Code,
+		"name":                co.Name,
+		"category":            co.Category,
+		"target_customers":    co.TargetCustomers,
+		"forbidden_customers": co.ForbiddenCustomers,
+		"scripts":             co.Scripts,
+		"sales_process":       co.SalesProcess,
+		"objection_handling":  co.ObjectionHandling,
+		"delivery_pitfalls":   co.DeliveryPitfalls,
+		"report_rules":        co.ReportRules,
+		"related_product_id":  co.RelatedProductID,
+		"status":              co.Status,
+		"created_at":          co.CreatedAt,
+		"updated_at":          co.UpdatedAt,
+	}
+	if co.RelatedProductID != nil {
+		var p model.Product
+		if store.DB.Where("id = ? AND status != ?", *co.RelatedProductID, "inactive").First(&p).Error == nil {
+			out["product"] = gin.H{"id": p.ID, "code": p.Code, "name": p.Name, "category": p.Category}
+		}
+	}
+
+	var medias []model.MediaFile
+	store.DB.Where("bind_type = ? AND bind_id = ? AND status = ?", "course", co.ID, "approved").
+		Order("id ASC").Find(&medias)
+	if len(medias) > 0 {
+		items := make([]gin.H, 0, len(medias))
+		for _, m := range medias {
+			items = append(items, gin.H{
+				"id":          m.ID,
+				"filename":    m.Filename,
+				"file_ext":    m.FileExt,
+				"preview_url": "/api/media/preview/" + strconv.FormatUint(uint64(m.ID), 10),
+			})
+		}
+		out["medias"] = items
+	}
+	web.OK(c, out)
+}
+
+// ListCourses GET /api/courses?category=&status=
+func ListCourses(c *gin.Context) {
+	q := store.DB.Model(&model.Course{})
+	if cat := c.Query("category"); cat != "" {
+		q = q.Where("category = ?", cat)
+	}
+	switch st := c.Query("status"); st {
+	case "": // 默认仅 active（员工浏览）
+		q = q.Where("status = ?", "active")
+	case "all": // 管理员维护全量
+	default:
+		q = q.Where("status = ?", st)
+	}
+	var items []model.Course
+	if err := q.Order("id ASC").Find(&items).Error; err != nil {
+		web.Fail(c, web.NewBadRequest("查询课程失败"))
+		return
+	}
+	web.OK(c, items)
+}
+
+// GetCourse GET /api/courses/{id}
+func GetCourse(c *gin.Context) {
+	id, ok := parseID(c, "id")
+	if !ok {
+		return
+	}
+	var co model.Course
+	if err := store.DB.First(&co, id).Error; err != nil {
+		web.Fail(c, web.NewNotFoundError("课程不存在"))
+		return
+	}
+	courseView(c, co)
+}
+
+// CreateCourse POST /api/courses (admin)
+func CreateCourse(c *gin.Context) {
+	var co model.Course
+	if err := c.ShouldBindJSON(&co); err != nil {
+		web.Fail(c, web.NewBadRequest("请求参数错误"))
+		return
+	}
+	if co.Code == "" || co.Name == "" || co.Category == "" {
+		web.Fail(c, web.NewBadRequest("编号、名称、分类为必填"))
+		return
+	}
+	var count int64
+	store.DB.Model(&model.Course{}).Where("code = ?", co.Code).Count(&count)
+	if count > 0 {
+		web.Fail(c, web.NewConflictError("课程编号已存在"))
+		return
+	}
+	if co.Status == "" {
+		co.Status = "active"
+	}
+	if err := store.DB.Create(&co).Error; err != nil {
+		web.Fail(c, web.NewBadRequest("创建课程失败"))
+		return
+	}
+	web.OK(c, co)
+}
+
+// UpdateCourse PUT /api/courses/{id} (admin) —— 支持绑定/解绑产品
+func UpdateCourse(c *gin.Context) {
+	id, ok := parseID(c, "id")
+	if !ok {
+		return
+	}
+	var co model.Course
+	if err := store.DB.First(&co, id).Error; err != nil {
+		web.Fail(c, web.NewNotFoundError("课程不存在"))
+		return
+	}
+	var req model.Course
+	if err := c.ShouldBindJSON(&req); err != nil {
+		web.Fail(c, web.NewBadRequest("请求参数错误"))
+		return
+	}
+	if req.Name == "" || req.Category == "" {
+		web.Fail(c, web.NewBadRequest("名称、分类为必填"))
+		return
+	}
+	if req.Status == "" {
+		req.Status = "active"
+	}
+
+	if req.Code != "" && req.Code != co.Code {
+		var count int64
+		store.DB.Model(&model.Course{}).Where("code = ? AND id <> ?", req.Code, id).Count(&count)
+		if count > 0 {
+			web.Fail(c, web.NewConflictError("课程编号已存在"))
+			return
+		}
+		co.Code = req.Code
+	}
+	co.Name = req.Name
+	co.Category = req.Category
+	co.TargetCustomers = req.TargetCustomers
+	co.ForbiddenCustomers = req.ForbiddenCustomers
+	co.Scripts = req.Scripts
+	co.SalesProcess = req.SalesProcess
+	co.ObjectionHandling = req.ObjectionHandling
+	co.DeliveryPitfalls = req.DeliveryPitfalls
+	co.ReportRules = req.ReportRules
+	co.RelatedProductID = req.RelatedProductID
+	co.Status = req.Status
+
+	if err := store.DB.Save(&co).Error; err != nil {
+		web.Fail(c, web.NewBadRequest("更新课程失败"))
+		return
+	}
+	courseView(c, co)
+}