Fix coroutine 'MCPAppClient.get_app_by_name' was never awaited (#583)

Author: StreetLamb

src/mcp_agent/cli/mcp_app/api_client.py

@@ -386,7 +386,7 @@ async def get_app_id_by_name(self, name: str) -> Optional[str]:
             httpx.HTTPStatusError: If the API returns an error
             httpx.HTTPError: If the request fails
         """
-        app = self.get_app_by_name(name)
+        app = await self.get_app_by_name(name)
         return app.appId if app else None
 
     async def deploy_app(