Fix Gradio launch parameters and function signature

- Remove invalid mcp_server parameter from app.launch()
- Fix simple_demo function to accept input parameter
- Resolve startup errors in HuggingFace Spaces deployment

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

app.py

@@ -33,8 +33,7 @@ if __name__ == "__main__":
             server_name="0.0.0.0",
             server_port=int(os.getenv("PORT", 7860)),
             share=False,
-            show_error=True,
-            mcp_server=True  # Enable MCP server for HuggingFace Spaces
+            show_error=True
         )
     except Exception as e:
         print(f"❌ Startup Error: {e}")
@@ -47,7 +46,7 @@ if __name__ == "__main__":
         print("\n🔄 Starting simplified interface...")
         import gradio as gr
         
-        def simple_demo():
+        def simple_demo(input_text):
             return "Multi-Agent Job Application Assistant is initializing. Please check back in a moment."
         
         demo = gr.Interface(