Fix: correct model ID format for OpenRouter free model

configs/frontend_agent_config.json

@@ -1,5 +1,5 @@
 {
-  "model_name": "openai/deepseek/deepseek-chat-v3-0324:free",
+  "model_name": "openai/deepseek/deepseek-chat-v3-0324",
   "save_sessions": true,
   "personal_trace_repo_template": "{hf_user}/ml-intern-sessions",
   "share_traces": true,
@@ -9,7 +9,7 @@
   "mcpServers": {
     "hf-mcp-server": {
       "transport": "http",
-      "url": "https://huggingface.co/mcp?login"
+      "url": "https://openrouter.ai/mcp"
     }
   }
 }