refactor: 收口技能与专员目录定义

统一 skill 与 specialist 清单，移除旧的 office 执行包与下线对象，并补入 text_to_speech、customer_followup 等当前目录定义与种子数据。

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

@@ -156,6 +156,8 @@ func RegisterRoutes(r *gin.Engine, cfg *config.Config) {
 	r.POST("/api/batch/files", middleware.Auth(cfg), ExtractFromFiles)
 	r.POST("/api/skills/office/execute", middleware.Auth(cfg), skillapi.ExecuteOfficeSkill)
 	r.POST("/api/skills/office/ocr", middleware.Auth(cfg), skillapi.ExecuteOfficeSkillOCR)
+	r.POST("/api/skills/office/tts", middleware.Auth(cfg), skillapi.ExecuteOfficeSkillTTS)
+	r.GET("/api/tts/audio/:filename", middleware.Auth(cfg), skillapi.ServeTTSAudio)
 	r.POST("/api/chat/message", middleware.Auth(cfg), HandleChatMessage)
 
 	// 语音工具