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/feishu_notifier.py

@@ -0,0 +1,96 @@
+"""飞书机器人通知 — 通过 Webhook 推送消息到飞书群聊"""
+from __future__ import annotations
+
+import logging
+from typing import Optional
+
+import httpx
+
+logger = logging.getLogger(__name__)
+
+FEISHU_TIMEOUT_SEC = 10
+
+
+def send_feishu_text(webhook_url: str, text: str) -> bool:
+    """发送纯文本消息到飞书群机器人。
+
+    Args:
+        webhook_url: 飞书机器人 webhook 地址
+        text: 消息文本
+
+    Returns:
+        是否发送成功
+    """
+    payload = {"msg_type": "text", "content": {"text": text}}
+    return _do_send(webhook_url, payload)
+
+
+def send_feishu_card(
+    webhook_url: str,
+    title: str,
+    body: str,
+    status: str = "info",
+    detail_link: Optional[str] = None,
+) -> bool:
+    """发送消息卡片到飞书群机器人。
+
+    Args:
+        webhook_url: 飞书机器人 webhook 地址
+        title: 卡片标题
+        body: 卡片正文（支持 Markdown）
+        status: 状态 — info / success / failed
+        detail_link: 详情链接（可选）
+
+    Returns:
+        是否发送成功
+    """
+    color_map = {"success": "green", "failed": "red", "info": "blue"}
+    color = color_map.get(status, "blue")
+
+    elements = [
+        {"tag": "markdown", "content": body},
+    ]
+    if detail_link:
+        elements.append({
+            "tag": "action",
+            "actions": [{"tag": "button", "text": {"tag": "plain_text", "content": "查看详情"}, "url": detail_link, "type": "default"}],
+        })
+
+    payload = {
+        "msg_type": "interactive",
+        "card": {
+            "header": {
+                "title": {"tag": "plain_text", "content": title},
+                "template": color,
+            },
+            "elements": elements,
+        },
+    }
+    return _do_send(webhook_url, payload)
+
+
+def _do_send(webhook_url: str, payload: dict) -> bool:
+    """底层 POST 发送，统一异常处理。"""
+    if not webhook_url or not webhook_url.startswith("https://open.feishu.cn/"):
+        logger.warning("飞书 webhook URL 无效: %s", webhook_url[:50] if webhook_url else "None")
+        return False
+
+    try:
+        with httpx.Client(timeout=FEISHU_TIMEOUT_SEC) as client:
+            resp = client.post(webhook_url, json=payload)
+            result = resp.json()
+            if resp.is_success and result.get("code") == 0:
+                logger.info("飞书通知发送成功: %s", result.get("msg"))
+                return True
+            else:
+                logger.warning(
+                    "飞书通知发送失败: status=%s code=%s msg=%s",
+                    resp.status_code, result.get("code"), result.get("msg"),
+                )
+                return False
+    except httpx.TimeoutException:
+        logger.warning("飞书通知发送超时: %s", webhook_url[:50])
+        return False
+    except Exception as e:
+        logger.warning("飞书通知发送异常: %s", e)
+        return False