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/services/event_handlers/notification_event_handler_test.go

@@ -16,47 +16,6 @@ import (
 	"gorm.io/gorm/schema"
 )
 
-func TestTicketAssignedInAppNotification(t *testing.T) {
-	setupNotificationEventHandlerTestDB(t)
-
-	ticket := &models.Ticket{
-		TicketNo:          "TK202604280001",
-		Title:             "退款处理",
-		Source:            enums.TicketSourceManual,
-		Status:            enums.TicketStatusPending,
-		CurrentAssigneeID: 11,
-		AuditFields: models.AuditFields{
-			CreatedAt: time.Now(),
-			UpdatedAt: time.Now(),
-		},
-	}
-	if err := repositories.TicketRepository.Create(sqls.DB(), ticket); err != nil {
-		t.Fatalf("create ticket error = %v", err)
-	}
-
-	if err := handleTicketAssignedInAppNotification(context.Background(), events.TicketAssignedEvent{
-		TicketID:   ticket.ID,
-		FromUserID: 0,
-		ToUserID:   11,
-		OperatorID: 1,
-		Reason:     "需要人工跟进",
-	}); err != nil {
-		t.Fatalf("handler error = %v", err)
-	}
-
-	list := repositories.NotificationRepository.Find(sqls.DB(), sqls.NewCnd().Eq("recipient_user_id", 11))
-	if len(list) != 1 {
-		t.Fatalf("expected 1 notification, got %d", len(list))
-	}
-	got := list[0]
-	if got.NotificationType != "ticket_assigned" || got.BizType != "ticket" || got.BizID != ticket.ID {
-		t.Fatalf("unexpected notification: %+v", got)
-	}
-	if got.ActionURL != "/dashboard/tickets?ticketId=1" {
-		t.Fatalf("unexpected action url: %q", got.ActionURL)
-	}
-}
-
 func TestConversationAssignedInAppNotification(t *testing.T) {
 	setupNotificationEventHandlerTestDB(t)
 
@@ -92,7 +51,7 @@ func TestConversationAssignedInAppNotification(t *testing.T) {
 	if got.NotificationType != "conversation_assigned" || got.BizType != "conversation" || got.BizID != conversation.ID {
 		t.Fatalf("unexpected notification: %+v", got)
 	}
-	if got.ActionURL != "/dashboard/conversations?conversationId=1" {
+	if got.ActionURL != "/dashboard/conversations?conversation_id=1" {
 		t.Fatalf("unexpected action url: %q", got.ActionURL)
 	}
 }
@@ -115,7 +74,7 @@ func setupNotificationEventHandlerTestDB(t *testing.T) *gorm.DB {
 			_ = sqlDB.Close()
 		}
 	})
-	if err := db.AutoMigrate(&models.Notification{}, &models.Ticket{}, &models.Conversation{}); err != nil {
+	if err := db.AutoMigrate(&models.Notification{}, &models.Conversation{}); err != nil {
 		t.Fatalf("auto migrate error = %v", err)
 	}
 	sqls.SetDB(db)