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/api/conversation_handler.go

@@ -1,6 +1,8 @@
 package api
 
 import (
+	"log/slog"
+
 	"code.tczkiot.com/wlw/ai-agent/internal/builders"
 	"code.tczkiot.com/wlw/ai-agent/internal/pkg/dto/request"
 	"code.tczkiot.com/wlw/ai-agent/internal/pkg/dto/response"
@@ -13,6 +15,68 @@ import (
 	"github.com/gin-gonic/gin"
 )
 
+func ConversationGetQuick_actions(ctx *gin.Context) {
+	if services.ChannelService.GetEnabledChannel(ctx) == nil {
+		httpx.WriteJSON(ctx, httpx.JsonErrorMsg(ctx, "error.e0211"))
+		return
+	}
+	external := httpx.GetExternalUser(ctx)
+	if external == nil {
+		httpx.WriteJSON(ctx, httpx.JsonErrorMsg(ctx, "error.e0150"))
+		return
+	}
+	conversationID, _ := params.GetInt64(ctx, "conversation_id")
+	conversation := services.ConversationService.Get(conversationID)
+	if conversation == nil {
+		httpx.WriteJSON(ctx, httpx.JsonErrorMsg(ctx, "error.e0116"))
+		return
+	}
+	if !services.ConversationService.IsCustomerConversationOwner(conversation, *external) {
+		httpx.WriteJSON(ctx, httpx.JsonErrorMsg(ctx, "error.e0222"))
+		return
+	}
+	actions, err := services.CustomerQuickActionService.ListForConversation(ctx, conversation)
+	if err != nil {
+		httpx.WriteJSON(ctx, err)
+		return
+	}
+	results := make([]response.CustomerQuickActionResponse, 0, len(actions))
+	for _, action := range actions {
+		results = append(results, response.CustomerQuickActionResponse{
+			Code: action.Code, Title: action.Title, Description: action.Description,
+		})
+	}
+	httpx.WriteJSON(ctx, results)
+}
+
+func ConversationPostQuick_action(ctx *gin.Context) {
+	if services.ChannelService.GetEnabledChannel(ctx) == nil {
+		httpx.WriteJSON(ctx, httpx.JsonErrorMsg(ctx, "error.e0211"))
+		return
+	}
+	external := httpx.GetExternalUser(ctx)
+	if external == nil {
+		httpx.WriteJSON(ctx, httpx.JsonErrorMsg(ctx, "error.e0150"))
+		return
+	}
+	req := request.ExecuteCustomerQuickActionRequest{}
+	if err := params.ReadJSON(ctx, &req); err != nil {
+		httpx.WriteJSON(ctx, err)
+		return
+	}
+	customerMessage, replyMessage, err := services.CustomerQuickActionService.ExecuteAndRecord(
+		ctx, req.ConversationID, req.Code, req.ClientMsgID, *external, httpx.GetRequestID(ctx),
+	)
+	if err != nil {
+		httpx.WriteJSON(ctx, err)
+		return
+	}
+	httpx.WriteJSON(ctx, response.CustomerQuickActionExecutionResponse{
+		CustomerMessage: builders.BuildMessageWithLocale(customerMessage, i18nx.Locale(ctx)),
+		ReplyMessage:    builders.BuildMessageWithLocale(replyMessage, i18nx.Locale(ctx)),
+	})
+}
+
 func ConversationGetBy(ctx *gin.Context) {
 	id, ok := httpx.GetPathInt64(ctx, "id")
 	if !ok {
@@ -59,6 +123,11 @@ func ConversationPostCreate_or_match(ctx *gin.Context) {
 
 	item, err := services.ConversationService.Create(*external, channel.ID, channel.AIAgentID)
 	if err != nil {
+		slog.ErrorContext(ctx.Request.Context(), "create or match conversation failed",
+			"channel_id", channel.ID,
+			"ai_agent_id", channel.AIAgentID,
+			"error", err,
+		)
 		httpx.WriteJSON(ctx, err)
 		return
 	}