fix(cli): pass log_level to uvicorn in web and api_server commands (#4144)

Explicitly pass the log_level parameter to uvicorn.Config in both
adk web and adk api_server commands. This ensures that Uvicorn's
internal logging respects the configured log level.

Closes #4139

Author: kotaitos

src/google/adk/cli/cli_tools_click.py

@@ -1291,6 +1291,7 @@ async def _lifespan(app: FastAPI):
       host=host,
       port=port,
       reload=reload,
+      log_level=log_level.lower(),
   )
 
   server = uvicorn.Server(config)
@@ -1367,6 +1368,7 @@ def cli_api_server(
       host=host,
       port=port,
       reload=reload,
+      log_level=log_level.lower(),
   )
   server = uvicorn.Server(config)
   server.run()