feat(modules): 帮助中心、工单、工作流与多渠道接入

补齐 FAQ、帮助中心、工单、可视化工作流及 Telegram/WhatsApp/Slack 等渠道模块。

backend/app/api/help_center/__init__.py

@@ -0,0 +1,32 @@
+"""
+Copyright 2024-2026 ChatterMate
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+Admin API for the FAQ manager + help center, split by concern
+(settings/branding, FAQ content, generation jobs; the custom-domain router
+joins in the domain-verification unit). Mounted at /api/v1/help-center.
+"""
+
+from fastapi import APIRouter
+
+from app.api.help_center.branding import router as branding_router
+from app.api.help_center.domain import router as domain_router
+from app.api.help_center.faqs import router as faqs_router
+from app.api.help_center.generation import router as generation_router
+
+router = APIRouter()
+router.include_router(branding_router)
+router.include_router(faqs_router)
+router.include_router(generation_router)
+router.include_router(domain_router)