feat: 添加中国节假日感知定时功能

- 新增 chinese_holidays 表，通过 timor.tech API 同步节假日数据
- 修正 holiday 字段解读：holiday=true → 休息日，holiday=false → 调休工作日
- 工作日 8:00-22:00 每小时爬取，周末/节假日/夜间自动跳过
- 新增 /api/v1/holidays/sync 和 /api/v1/holidays/today 接口
- 企微菜单新增「同步节假日」按钮，支持手动触发同步

app/wechat/menu.py

@@ -0,0 +1,87 @@
+import logging
+
+import httpx
+
+from app.config import settings
+
+logger = logging.getLogger(__name__)
+
+MENU = {
+    "button": [
+        {
+            "name": "今日公告",
+            "type": "click",
+            "key": "today_stats",
+        },
+        {
+            "name": "系统管理",
+            "sub_button": [
+                {
+                    "name": "立即爬取",
+                    "type": "click",
+                    "key": "trigger_crawl",
+                },
+                {
+                    "name": "同步节假日",
+                    "type": "click",
+                    "key": "sync_holidays",
+                },
+            ],
+        },
+    ]
+}
+
+
+class MenuManager:
+    def __init__(self, client=None):
+        self.client = client
+
+    async def _get_token(self) -> str | None:
+        from app.wechat.client import WeChatClient
+        c = self.client or WeChatClient()
+        return await c._get_access_token()
+
+    async def create(self) -> bool:
+        token = await self._get_token()
+        if not token:
+            return False
+
+        url = "https://qyapi.weixin.qq.com/cgi-bin/menu/create"
+        params = {"access_token": token, "agentid": int(settings.wechat_agent_id)}
+
+        async with httpx.AsyncClient(timeout=15) as client:
+            response = await client.post(url, params=params, json=MENU)
+            data = response.json()
+            if data.get("errcode") == 0:
+                logger.info("企微菜单创建成功")
+                return True
+            logger.error(f"企微菜单创建失败: {data}")
+        return False
+
+    async def delete(self) -> bool:
+        token = await self._get_token()
+        if not token:
+            return False
+
+        url = "https://qyapi.weixin.qq.com/cgi-bin/menu/delete"
+        params = {"access_token": token, "agentid": int(settings.wechat_agent_id)}
+
+        async with httpx.AsyncClient(timeout=15) as client:
+            response = await client.get(url, params=params)
+            data = response.json()
+            return data.get("errcode") == 0
+
+    async def get(self) -> dict | None:
+        token = await self._get_token()
+        if not token:
+            return None
+
+        url = "https://qyapi.weixin.qq.com/cgi-bin/menu/get"
+        params = {"access_token": token, "agentid": int(settings.wechat_agent_id)}
+
+        async with httpx.AsyncClient(timeout=15) as client:
+            response = await client.get(url, params=params)
+            data = response.json()
+            if data.get("errcode") == 0:
+                return data
+        return None