feat(mcp_server): use default theme

mcp_server.py

@@ -7,7 +7,7 @@ import os
 import json
 from fastmcp import FastMCP
 from huggingface_hub import HfApi, model_info, ModelCard, ModelCardData
-from huggingface_hub.utils import HfHubHTTPError
+from huggingface_hub.errors import HfHubHTTPError
 from dotenv import load_dotenv
 
 load_dotenv()
@@ -123,6 +123,8 @@ This PR adds the `{new_tag}` tag to the model repository.
 
 **Current tags:** {", ".join(current_tags) if current_tags else "None"}
 **New tags:** {", ".join(updated_tags)}
+
+🤖 This is a pull request created by the Hugging Face Hub Tagging Bot.
 """
 
         print(f"🚀 Creating PR with title: {pr_title}")