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/pkg/toolx/builtin_tools_test.go

@@ -1,23 +1,19 @@
 package toolx
 
-import (
-	"testing"
-
-	"code.tczkiot.com/wlw/ai-agent/internal/pkg/i18nx"
-)
+import "testing"
 
 func TestResolveToolMetadata(t *testing.T) {
-	item := ResolveToolMetadata("builtin/create_ticket_with_confirmation", "")
-	if item.ToolCode != GraphCreateTicketConfirm.Code {
+	item := ResolveToolMetadata(GraphHandoffConversation.Code, "")
+	if item.ToolCode != GraphHandoffConversation.Code {
 		t.Fatalf("unexpected tool code: %s", item.ToolCode)
 	}
-	if item.ServerCode != GraphCreateTicketConfirm.ServerCode {
+	if item.ServerCode != GraphHandoffConversation.ServerCode {
 		t.Fatalf("unexpected server code: %s", item.ServerCode)
 	}
-	if item.ToolName != GraphCreateTicketConfirm.Name {
+	if item.ToolName != GraphHandoffConversation.Name {
 		t.Fatalf("unexpected tool name: %s", item.ToolName)
 	}
-	if item.SourceType != GraphCreateTicketConfirm.SourceType {
+	if item.SourceType != GraphHandoffConversation.SourceType {
 		t.Fatalf("unexpected source type: %s", item.SourceType)
 	}
 }
@@ -37,28 +33,3 @@ func TestResolveToolMetadataFallsBackToName(t *testing.T) {
 		t.Fatalf("unexpected source type: %s", item.SourceType)
 	}
 }
-
-func TestRegisteredToolTextUsesEnglishLocale(t *testing.T) {
-	title := GetRegisteredToolTitleLocale(GraphCreateTicketConfirm.Code, i18nx.LocaleEnUS)
-	if title != "Create Ticket With Confirmation" {
-		t.Fatalf("unexpected english title: %q", title)
-	}
-
-	description := GetRegisteredToolDescriptionLocale(GraphCreateTicketConfirm.Code, i18nx.LocaleEnUS)
-	want := "Guides ticket creation with parameter preparation, customer confirmation, actual ticket creation, and final result delivery."
-	if description != want {
-		t.Fatalf("unexpected english description: %q", description)
-	}
-}
-
-func TestRegisteredToolTextKeepsChineseLocale(t *testing.T) {
-	title := GetRegisteredToolTitleLocale(GraphCreateTicketConfirm.Code, i18nx.LocaleZhCN)
-	if title != "创建工单确认流程" {
-		t.Fatalf("unexpected chinese title: %q", title)
-	}
-
-	description := GetRegisteredToolDescriptionLocale(GraphCreateTicketConfirm.Code, i18nx.LocaleZhCN)
-	if description != "Graph Tool。处理工单参数准备、用户确认、实际创建工单和结果返回。" {
-		t.Fatalf("unexpected chinese description: %q", description)
-	}
-}