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/webhooks/line.py

@@ -0,0 +1,58 @@
+"""
+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 uuid import UUID
+
+from fastapi import APIRouter, BackgroundTasks, Depends, HTTPException, Request
+from sqlalchemy.orm import Session
+
+from app.api.webhooks.common import is_duplicate_message
+from app.channels import get_adapter
+from app.core.logger import get_logger
+from app.database import get_db
+from app.models.channels import ChannelType
+from app.repositories.channels import ChannelAccountRepository
+from app.services.channel_chat import process_channel_message
+
+router = APIRouter()
+logger = get_logger(__name__)
+
+
+@router.post("/{account_id}")
+async def line_webhook(
+    account_id: UUID,
+    request: Request,
+    background_tasks: BackgroundTasks,
+    db: Session = Depends(get_db),
+):
+    """LINE Messaging API webhook, verified via X-Line-Signature."""
+    account = ChannelAccountRepository(db).get_by_id(account_id)
+    if account is None or account.channel_type != ChannelType.LINE.value:
+        raise HTTPException(status_code=404, detail="Unknown account")
+
+    adapter = get_adapter(ChannelType.LINE.value)
+    raw_body = await request.body()
+    if not await adapter.verify_webhook(dict(request.headers), raw_body, account):
+        raise HTTPException(status_code=403, detail="Invalid signature")
+
+    payload = await request.json()
+    for inbound in adapter.parse_inbound(payload):
+        if is_duplicate_message(ChannelType.LINE.value,
+                                f"{account.id}:{inbound.external_message_id}"):
+            continue
+        background_tasks.add_task(process_channel_message, account.id, inbound)
+
+    return {"status": "ok"}