feat: hot reload for config/templates and GitPython-based hot update with pre-update notification

bot.py

@@ -2,11 +2,13 @@
 import asyncio
 import logging
 import sys
+from pathlib import Path
 
 import monitor
 import templates
 from alerter import Alerter
 from onebot import OneBotServer
+from updater import Updater
 
 logging.basicConfig(
     level=logging.INFO,
@@ -203,15 +205,40 @@ class Bot:
         await self.ob.start(self.on_event)
         alerter = Alerter(self.ob, self.cfg.get("alert", {}))
         alerter.start()
+        updater = Updater(self.ob, self.cfg.get("update", {}))
+        if self.cfg.get("update", {}).get("enabled", False):
+            updater.start()
+        watcher = asyncio.get_running_loop().create_task(self._watch_config(alerter))
         log.info("机器人就绪，等待 OneBot 实现端连接...")
         try:
             await asyncio.Event().wait()
         except (KeyboardInterrupt, asyncio.CancelledError):
             pass
         finally:
+            watcher.cancel()
+            await updater.stop()
             await alerter.stop()
             await self.ob.stop()
 
+    async def _watch_config(self, alerter: Alerter, interval: float = 5.0):
+        """监测 config.toml 修改并热重载（端口/token 等需重启的项不生效）。"""
+        path = Path("config.toml")
+        last = path.stat().st_mtime
+        while True:
+            await asyncio.sleep(interval)
+            try:
+                mtime = path.stat().st_mtime
+                if mtime == last:
+                    continue
+                last = mtime
+                cfg = load_config()
+                alerter.apply_config(cfg.get("alert", {}))
+                log.info("配置已热重载 (端口/access_token 变更需重启生效)")
+            except FileNotFoundError:
+                continue
+            except Exception:
+                log.exception("配置热重载失败")
+
 
 def main():
     if sys.platform == "win32":