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/middleware/auth_middleware.go

@@ -1,11 +1,10 @@
 package middleware
 
 import (
-	"code.tczkiot.com/wlw/ai-agent/internal/pkg/i18nx"
+	"code.tczkiot.com/wlw/ai-agent/internal/pkg/httpx"
 	"code.tczkiot.com/wlw/ai-agent/internal/services"
 
 	"github.com/gin-gonic/gin"
-	"github.com/mlogclub/simple/web"
 )
 
 func AuthMiddleware(ctx *gin.Context) {
@@ -17,10 +16,7 @@ func AuthMiddleware(ctx *gin.Context) {
 
 func authenticateRequest(ctx *gin.Context) bool {
 	if _, err := services.AuthService.Authenticate(ctx); err != nil {
-		result := web.JsonError(err)
-		result.Message = i18nx.T(ctx, "error.auth.expired")
-		ctx.JSON(200, result)
-		ctx.Abort()
+		httpx.AbortJSON(ctx, 200, err)
 		return false
 	}
 	return true

internal/middleware/chat_middleware.go

@@ -1,6 +1,9 @@
 package middleware
 
 import (
+	"net/url"
+	"strings"
+
 	"code.tczkiot.com/wlw/ai-agent/internal/pkg/httpx"
 	"code.tczkiot.com/wlw/ai-agent/internal/services"
 
@@ -10,16 +13,33 @@ import (
 func ExternalUserMiddleware(ctx *gin.Context) {
 	channel := services.ChannelService.GetEnabledChannel(ctx)
 	if channel == nil {
-		ctx.JSON(200, httpx.JsonErrorMsg(ctx, "error.e0210"))
-		ctx.Abort()
+		httpx.AbortJSON(ctx, 200, httpx.JsonErrorMsg(ctx, "error.e0210"))
 		return
 	}
-	external, err := services.SubjectService.CurrentExternal(ctx.Request.Context())
+	external, err := services.SubjectService.ResolveExternal(
+		ctx.Request.Context(),
+		requestExternalValue(ctx, "X-External-Id", "external_id"),
+		decodeExternalName(requestExternalValue(ctx, "X-External-Name", "external_name")),
+	)
 	if err != nil {
-		ctx.JSON(200, httpx.JsonErrorMsg(ctx, "error.auth.expired"))
-		ctx.Abort()
+		httpx.AbortJSON(ctx, 200, httpx.JsonErrorMsg(ctx, "error.auth.expired"))
 		return
 	}
 	httpx.SetExternalUser(ctx, external)
 	ctx.Next()
 }
+
+func requestExternalValue(ctx *gin.Context, header, query string) string {
+	if value := strings.TrimSpace(ctx.GetHeader(header)); value != "" {
+		return value
+	}
+	return strings.TrimSpace(ctx.Query(query))
+}
+
+func decodeExternalName(value string) string {
+	decoded, err := url.QueryUnescape(strings.TrimSpace(value))
+	if err != nil {
+		return strings.TrimSpace(value)
+	}
+	return strings.TrimSpace(decoded)
+}