Pre-initialize restart locks for clients in GeminiClientPool

Author: luuquangvu

app/services/pool.py

@@ -31,6 +31,7 @@ def __init__(self) -> None:
             self._clients.append(client)
             self._id_map[c.id] = client
             self._round_robin.append(client)
+            self._restart_locks[c.id] = asyncio.Lock()  # Pre-initialize
 
     async def init(self) -> None:
         """Initialize all clients in the pool."""
@@ -73,8 +74,7 @@ async def _ensure_client_ready(self, client: GeminiClientWrapper) -> bool:
 
         lock = self._restart_locks.get(client.id)
         if lock is None:
-            lock = asyncio.Lock()
-            self._restart_locks[client.id] = lock
+            return False  # Should not happen
 
         async with lock:
             if client.running: