fix: update vllm serve comment to --runner pooling

router.py

@@ -12,7 +12,7 @@ Usage:
     result = router.route_text("What is the capital of France?")
 
     # Option B: Remote vLLM server (no local GPU needed for embedding)
-    #   Start server: vllm serve Qwen/Qwen3-0.6B --task embed
+    #   Start server: vllm serve Qwen/Qwen3-0.6B --runner pooling
     router = R2Router.from_pretrained(path, embed_url="http://localhost:8000")
     result = router.route_text("What is the capital of France?")