refactor: 将客服后端重构为宿主可嵌入模块

- 注入数据库、运行时配置、统一响应、文件存储和平台 AI 能力，补充业务读写工具与客户快捷操作契约。

- 移除模块内重复的组织、客户、工单、标签、技能、旧工作流、MCP 和迁移实现，将身份权限与业务主体交由宿主管理。

- 使用 libSQL 重构向量存储，并完善图片消息、访客身份、排队调度、企业微信和支持聊天页面。

- 统一 HTTP、DTO 与 WebSocket 的 snake_case 协议，补齐模块初始化、业务动作和公共载荷等回归测试。

internal/handlers/dashboard/knowledge_faq_handler.go

@@ -36,7 +36,7 @@ func KnowledgeFAQGetExport(ctx *gin.Context) {
 		httpx.WriteJSON(ctx, err)
 		return
 	}
-	knowledgeBaseID, ok := params.GetInt64(ctx, "knowledgeBaseId")
+	knowledgeBaseID, ok := params.GetInt64(ctx, "knowledge_base_id")
 	if !ok || knowledgeBaseID <= 0 {
 		httpx.WriteJSON(ctx, errorsx.InvalidParamI18n("error.e0283"))
 		return
@@ -62,7 +62,7 @@ func KnowledgeFAQPostImport(ctx *gin.Context) {
 			return
 		}
 	}
-	knowledgeBaseID, ok := params.GetInt64(ctx, "knowledgeBaseId")
+	knowledgeBaseID, ok := params.GetInt64(ctx, "knowledge_base_id")
 	if !ok || knowledgeBaseID <= 0 {
 		httpx.WriteJSON(ctx, errorsx.InvalidParamI18n("error.e0283"))
 		return
@@ -99,12 +99,12 @@ func KnowledgeFAQAnyList(ctx *gin.Context) {
 	}
 
 	cnd := params.NewPagedSqlCnd(ctx,
-		params.QueryFilter{ParamName: "knowledgeBaseId"},
+		params.QueryFilter{ParamName: "knowledge_base_id"},
 		params.QueryFilter{ParamName: "question", Op: params.Like},
-		params.QueryFilter{ParamName: "indexStatus"},
+		params.QueryFilter{ParamName: "index_status"},
 	).Desc("id")
-	knowledgeBaseID, _ := params.GetInt64(ctx, "knowledgeBaseId")
-	if directoryID, ok := params.GetInt64(ctx, "directoryId"); ok {
+	knowledgeBaseID, _ := params.GetInt64(ctx, "knowledge_base_id")
+	if directoryID, ok := params.GetInt64(ctx, "directory_id"); ok {
 		cnd.Where("directory_id = ?", directoryID)
 	}
 	list, paging := services.KnowledgeFAQService.FindPageByCnd(cnd)