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。

cmd/testdata/main.go

@@ -7,9 +7,8 @@ import (
 	"code.tczkiot.com/wlw/ai-agent/cmd/testdata/kb"
 	"code.tczkiot.com/wlw/ai-agent/cmd/testdata/quickreply"
 	"code.tczkiot.com/wlw/ai-agent/cmd/testdata/seedlang"
-	"code.tczkiot.com/wlw/ai-agent/cmd/testdata/skill"
-	"code.tczkiot.com/wlw/ai-agent/cmd/testdata/tag"
 	"code.tczkiot.com/wlw/ai-agent/internal/bootstrap"
+	"code.tczkiot.com/wlw/ai-agent/internal/models"
 	"code.tczkiot.com/wlw/ai-agent/internal/pkg/config"
 	"flag"
 	"fmt"
@@ -63,10 +62,10 @@ func run() error {
 	}
 	slog.Info("reset all tables success", slog.Int("droppedTableCount", droppedTableCount))
 
-	if err := bootstrap.InitMigrations(); err != nil {
-		return fmt.Errorf("run migrations failed: %w", err)
+	if err := db.AutoMigrate(models.Models...); err != nil {
+		return fmt.Errorf("create testdata schema failed: %w", err)
 	}
-	slog.Info("run migrations success")
+	slog.Info("create testdata schema success")
 
 	aiConfigResult, err := aiconfig.Init()
 	if err != nil {
@@ -87,12 +86,6 @@ func run() error {
 		slog.Int("updatedFAQs", kbResult.UpdatedFAQs),
 	)
 
-	skillResult, err := skill.Init(lang)
-	if err != nil {
-		return fmt.Errorf("init skill failed: %w", err)
-	}
-	slog.Info("skill init success", slog.Int("created", skillResult.Created), slog.Int("updated", skillResult.Updated))
-
 	aiAgentResult, err := aiagent.Init(lang)
 	if err != nil {
 		return fmt.Errorf("init ai agent failed: %w", err)
@@ -105,11 +98,6 @@ func run() error {
 	}
 	slog.Info("channel init success", slog.Int("created", channelResult.Created), slog.Int("updated", channelResult.Updated))
 
-	if err := tag.Init(lang); err != nil {
-		slog.Error("init tag failed", "error", err)
-	}
-	slog.Info("tag init success")
-
 	if err := quickreply.Init(lang); err != nil {
 		return fmt.Errorf("init quick reply failed: %w", err)
 	}