feat: 集成飞书通知和机器人对话系统

- 新增通知系统 (notifications 表、服务、API)
- 新增飞书定时任务结果推送 (webhook + 应用消息)
- 新增飞书应用消息发送服务 (feishu_app_service)
- 新增飞书 WebSocket 长连接事件监听 (苹果应用)
- 新增飞书账号绑定/解绑 API
- 新增橙子飞书机器人 (独立 WS 连接，固定路由到橙子助手 Agent)
- 执行记录添加 schedule_id，用户添加飞书绑定字段

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/api/notifications.py

@@ -0,0 +1,115 @@
+"""通知 API — 列表、已读、删除"""
+from __future__ import annotations
+
+import logging
+from datetime import datetime
+from typing import List, Optional
+
+from fastapi import APIRouter, Depends, HTTPException, Query
+from pydantic import BaseModel
+from sqlalchemy.orm import Session
+
+from app.api.auth import get_current_user
+from app.core.database import get_db
+from app.models.user import User
+from app.services.notification_service import (
+    delete_notification,
+    get_unread_count,
+    get_user_notifications,
+    mark_all_as_read,
+    mark_as_read,
+)
+
+logger = logging.getLogger(__name__)
+router = APIRouter(prefix="/api/v1/notifications", tags=["notifications"])
+
+
+# ─── Pydantic Schemas ──────────────────────────────────────────────
+
+
+class NotificationResponse(BaseModel):
+    id: str
+    user_id: str
+    title: str
+    content: Optional[str] = None
+    category: str
+    ref_type: Optional[str] = None
+    ref_id: Optional[str] = None
+    is_read: bool
+    created_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+class UnreadCountResponse(BaseModel):
+    count: int
+
+
+# ─── API Endpoints ─────────────────────────────────────────────────
+
+
+@router.get("", response_model=List[NotificationResponse])
+async def list_notifications(
+    unread_only: bool = Query(False, description="仅未读"),
+    category: Optional[str] = Query(None, description="按分类过滤"),
+    limit: int = Query(50, ge=1, le=200),
+    offset: int = Query(0, ge=0),
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """获取当前用户的通知列表。"""
+    return get_user_notifications(
+        db,
+        user_id=current_user.id,
+        unread_only=unread_only,
+        category=category,
+        limit=limit,
+        offset=offset,
+    )
+
+
+@router.get("/unread-count", response_model=UnreadCountResponse)
+async def unread_count(
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """获取当前用户的未读通知数。"""
+    count = get_unread_count(db, current_user.id)
+    return {"count": count}
+
+
+@router.put("/{notification_id}/read")
+async def read_notification(
+    notification_id: str,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """将一条通知标记为已读。"""
+    result = mark_as_read(db, notification_id, current_user.id)
+    if not result:
+        raise HTTPException(status_code=404, detail="通知不存在")
+    return {"message": "已标记为已读"}
+
+
+@router.put("/read-all")
+async def read_all_notifications(
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """将所有通知标记为已读。"""
+    count = mark_all_as_read(db, current_user.id)
+    return {"message": f"已将 {count} 条通知标记为已读"}
+
+
+@router.delete("/{notification_id}")
+async def remove_notification(
+    notification_id: str,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db),
+):
+    """删除一条通知。"""
+    ok = delete_notification(db, notification_id, current_user.id)
+    if not ok:
+        raise HTTPException(status_code=404, detail="通知不存在")
+    return {"message": "通知已删除"}