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/bootstrap/init.go

@@ -1,17 +1,50 @@
 package bootstrap
 
 import (
+	"context"
+	"log/slog"
+
 	"code.tczkiot.com/wlw/ai-agent/internal/ai/rag/vectordb"
 	"code.tczkiot.com/wlw/ai-agent/internal/pkg/config"
 	"code.tczkiot.com/wlw/ai-agent/internal/pkg/i18nx"
 	"code.tczkiot.com/wlw/ai-agent/internal/pkg/logx"
 	"code.tczkiot.com/wlw/ai-agent/internal/services/cronx"
-	"code.tczkiot.com/wlw/ai-agent/internal/wxwork"
-	"log/slog"
-
 	_ "code.tczkiot.com/wlw/ai-agent/internal/services/event_handlers"
+	"code.tczkiot.com/wlw/ai-agent/internal/wxwork"
+
+	"gorm.io/gorm"
 )
 
+type LoadSettingsFunc func(ctx context.Context, prefix string) (map[string]string, error)
+
+// InitModule initializes AI Agent with infrastructure owned by the host
+// application. It never opens a database connection or reads a private
+// configuration table, and it never creates or migrates database tables.
+func InitModule(database *gorm.DB, tablePrefix string, loadSettings LoadSettingsFunc) error {
+	settings, err := loadSettings(context.Background(), config.SettingsPrefix)
+	if err != nil {
+		return err
+	}
+	cfg, err := config.FromSettings(settings)
+	if err != nil {
+		return err
+	}
+	config.SetCurrent(cfg)
+	i18nx.SetDefaultLocale(cfg.LanguageOrDefault())
+
+	if err := UseDatabase(database, tablePrefix); err != nil {
+		return err
+	}
+	if err := vectordb.Init(&cfg.VectorDB); err != nil {
+		slog.Error("init vector db failed", "error", err)
+		return err
+	}
+	cronx.Init()
+	wxwork.SetSettingsLoader(wxwork.SettingsLoader(loadSettings))
+	wxwork.Init()
+	return nil
+}
+
 func Init(configPath string) error {
 	cfg, err := config.Load(configPath)
 	if err != nil {
@@ -31,10 +64,6 @@ func Init(configPath string) error {
 		slog.Error("init db failed", "error", err)
 		return err
 	}
-	if err := InitMigrations(); err != nil {
-		slog.Error("init migrations failed", "error", err)
-		return err
-	}
 	if err := vectordb.Init(&cfg.VectorDB); err != nil {
 		slog.Error("init vector db failed", "error", err)
 		return err
@@ -43,6 +72,7 @@ func Init(configPath string) error {
 	// 启动任务调度器
 	cronx.Init()
 
+	wxwork.SetSettingsLoader(nil)
 	wxwork.Init()
 	return nil
 }