fix(telegram): back off on transient polling failures

Give getUpdates a wider HTTP timeout than the long-poll window, log transient SSL/network disconnects as warnings, apply exponential backoff with recovery logging, and only escalate to error after five consecutive failures.

reaction_board/notify/telegram.py

@@ -86,9 +86,17 @@ class TelegramClient:
         self.poll_timeout = poll_timeout
         self.logger = logger
 
-    def _call(self, method: str, params: Mapping[str, Any] | None = None) -> Any:
+    def _call(
+        self,
+        method: str,
+        params: Mapping[str, Any] | None = None,
+        *,
+        timeout: float | None = None,
+    ) -> Any:
         url = f"https://api.telegram.org/bot{self.token}/{method}"
-        payload = self.transport.post(url, params or {}, timeout=self.timeout)
+        payload = self.transport.post(
+            url, params or {}, timeout=self.timeout if timeout is None else timeout
+        )
         if not isinstance(payload, Mapping):
             raise TelegramError("Telegram 响应不是对象")
         if not payload.get("ok"):
@@ -145,7 +153,10 @@ class TelegramClient:
         }
         if offset is not None:
             params["offset"] = int(offset)
-        result = self._call("getUpdates", params)
+        # 长轮询本身会挂起 poll_timeout 秒，HTTP 读超时必须留出更大余量。
+        result = self._call(
+            "getUpdates", params, timeout=self.poll_timeout + 15
+        )
         return result if isinstance(result, list) else []
 
     def answer_callback(self, callback_id: str, text: str = "") -> Any: