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/channels/__init__.py

@@ -0,0 +1,40 @@
+"""
+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.
+"""
+
+from fastapi import APIRouter
+
+from app.api.channels.accounts import router as accounts_router
+from app.api.channels.telegram import router as telegram_router
+from app.api.channels.meta import router as meta_router
+from app.api.channels.whatsapp_messaging import router as whatsapp_messaging_router
+from app.api.channels.slack import router as slack_router
+from app.api.channels.email import router as email_router
+from app.api.channels.sms import router as sms_router
+from app.api.channels.line import router as line_router
+from app.api.channels.agent_config import router as agent_config_router
+
+# Aggregates channel onboarding/management routes under /channels
+router = APIRouter()
+router.include_router(accounts_router, tags=["channels"])
+router.include_router(telegram_router, prefix="/telegram", tags=["channels"])
+router.include_router(meta_router, prefix="/meta", tags=["channels"])
+# Same prefix: onboarding and messaging are separate modules, one URL space.
+router.include_router(whatsapp_messaging_router, prefix="/meta", tags=["channels"])
+router.include_router(slack_router, prefix="/slack", tags=["channels"])
+router.include_router(email_router, prefix="/email", tags=["channels"])
+router.include_router(sms_router, prefix="/sms", tags=["channels"])
+router.include_router(line_router, prefix="/line", tags=["channels"])
+router.include_router(agent_config_router, prefix="/agent-config", tags=["channels"])