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/ws_service_test.go

@@ -1,11 +1,62 @@
 package services
 
 import (
+	"net/http"
+	"strings"
 	"testing"
 
 	"code.tczkiot.com/wlw/ai-agent/internal/pkg/dto/response"
 )
 
+func TestRealtimeEventJSONUsesSnakeCaseFields(t *testing.T) {
+	event := RealtimeEvent{
+		EventID: "event-1",
+		Type:    "message.created",
+		Data: RealtimeMessageCreatedPayload{
+			ConversationID: 12,
+			MessageID:      34,
+		},
+	}
+	body, err := marshalRealtimeEvent(event)
+	if err != nil {
+		t.Fatal(err)
+	}
+	text := string(body)
+	for _, field := range []string{`"event_id"`, `"conversation_id"`, `"message_id"`} {
+		if !strings.Contains(text, field) {
+			t.Fatalf("expected %s in %s", field, text)
+		}
+	}
+	if strings.Contains(text, "eventId") || strings.Contains(text, "conversationId") {
+		t.Fatalf("unexpected camelCase field in %s", text)
+	}
+}
+
+func TestWebsocketUpgradeHeaderEchoesBearerProtocol(t *testing.T) {
+	req, err := http.NewRequest(http.MethodGet, "http://example.com/api/ws/dashboard", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	req.Header.Set("Sec-WebSocket-Protocol", "bearer.header-safe-token")
+
+	header := websocketUpgradeHeader(req)
+	if got := header.Get("Sec-WebSocket-Protocol"); got != "bearer.header-safe-token" {
+		t.Fatalf("expected bearer protocol to be echoed, got %q", got)
+	}
+}
+
+func TestWebsocketUpgradeHeaderIgnoresNonBearerProtocol(t *testing.T) {
+	req, err := http.NewRequest(http.MethodGet, "http://example.com/api/ws/dashboard", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+	req.Header.Set("Sec-WebSocket-Protocol", "chat")
+
+	if header := websocketUpgradeHeader(req); header != nil {
+		t.Fatalf("expected non-bearer protocol to be ignored, got %v", header)
+	}
+}
+
 func TestWsNotificationTopic(t *testing.T) {
 	svc := newWsService()
 	if got := svc.notificationTopic(123); got != "notification:123" {