feat(bridge): build 8 notify 超时+connect subscribe 选项（OTA 净连接）

src/ppclock/bridge.py

@@ -46,12 +46,13 @@ class BridgeTransport:
 
     def __init__(self, address: str | None = None, timeout: float = 10.0,
                  *, host: str, port: int = DEFAULT_PORT,
-                 name_prefix: str = "NRF-"):
+                 name_prefix: str = "NRF-", subscribe: bool = True):
         self.address = address
         self.timeout = timeout
         self.host = host
         self.port = port
         self.name_prefix = name_prefix
+        self.subscribe = subscribe  # OTA 用 False（净连接，避开订阅抖动）
         self._reader: asyncio.StreamReader | None = None
         self._writer: asyncio.StreamWriter | None = None
         self._reader_task: asyncio.Task | None = None
@@ -77,7 +78,8 @@ class BridgeTransport:
                     raise BridgeError(f"bridge 未发现 {self.name_prefix!r} 前缀设备")
                 self.address = devices[0]["address"]
             await self._rpc("connect", 90.0 + self.timeout,
-                            address=self.address, timeout=self.timeout)
+                            address=self.address, timeout=self.timeout,
+                            subscribe=self.subscribe)
         except Exception:
             await self._teardown()
             raise