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/services/notification_service.py

@@ -0,0 +1,128 @@
+"""通知服务 — 创建与查询系统通知"""
+from __future__ import annotations
+
+import logging
+from datetime import datetime
+from typing import List, Optional
+
+from sqlalchemy.orm import Session
+
+from app.models.notification import Notification
+
+logger = logging.getLogger(__name__)
+
+
+def create_notification(
+    db: Session,
+    user_id: str,
+    title: str,
+    content: Optional[str] = None,
+    category: str = "system",
+    ref_type: Optional[str] = None,
+    ref_id: Optional[str] = None,
+) -> Notification:
+    """创建一条通知。
+
+    Args:
+        db: 数据库会话
+        user_id: 接收用户 ID
+        title: 通知标题
+        content: 通知正文（可选）
+        category: 分类，如 schedule / alert / system
+        ref_type: 关联对象类型
+        ref_id: 关联对象 ID
+
+    Returns:
+        创建的 Notification ORM 对象
+    """
+    notification = Notification(
+        user_id=user_id,
+        title=title,
+        content=content,
+        category=category,
+        ref_type=ref_type,
+        ref_id=ref_id,
+    )
+    db.add(notification)
+    db.flush()
+    logger.info("通知已创建: user=%s title=%s category=%s", user_id, title, category)
+    return notification
+
+
+def get_user_notifications(
+    db: Session,
+    user_id: str,
+    unread_only: bool = False,
+    category: Optional[str] = None,
+    limit: int = 50,
+    offset: int = 0,
+) -> List[Notification]:
+    """获取用户的通知列表（按创建时间倒序）。
+
+    Args:
+        db: 数据库会话
+        user_id: 用户 ID
+        unread_only: 仅未读
+        category: 按分类过滤
+        limit: 分页大小
+        offset: 分页偏移
+
+    Returns:
+        通知列表
+    """
+    query = db.query(Notification).filter(Notification.user_id == user_id)
+
+    if unread_only:
+        query = query.filter(Notification.is_read == False)  # noqa: E712
+    if category:
+        query = query.filter(Notification.category == category)
+
+    return query.order_by(Notification.created_at.desc()).offset(offset).limit(limit).all()
+
+
+def get_unread_count(db: Session, user_id: str) -> int:
+    """获取用户未读通知数。"""
+    return (
+        db.query(Notification)
+        .filter(Notification.user_id == user_id, Notification.is_read == False)  # noqa: E712
+        .count()
+    )
+
+
+def mark_as_read(db: Session, notification_id: str, user_id: str) -> Optional[Notification]:
+    """将指定通知标记为已读。"""
+    notification = (
+        db.query(Notification)
+        .filter(Notification.id == notification_id, Notification.user_id == user_id)
+        .first()
+    )
+    if not notification:
+        return None
+    notification.is_read = True
+    db.flush()
+    return notification
+
+
+def mark_all_as_read(db: Session, user_id: str) -> int:
+    """将用户所有通知标记为已读。返回更新的条数。"""
+    count = (
+        db.query(Notification)
+        .filter(Notification.user_id == user_id, Notification.is_read == False)  # noqa: E712
+        .update({"is_read": True})
+    )
+    db.flush()
+    return count
+
+
+def delete_notification(db: Session, notification_id: str, user_id: str) -> bool:
+    """删除一条通知。"""
+    notification = (
+        db.query(Notification)
+        .filter(Notification.id == notification_id, Notification.user_id == user_id)
+        .first()
+    )
+    if not notification:
+        return False
+    db.delete(notification)
+    db.flush()
+    return True