update PR deploy

backend_deploy.py

@@ -1384,14 +1384,25 @@ Generated by [AnyCoder](https://huggingface.co/spaces/akhaliq/anycoder)"""
                     else:
                         files["app.py"] = cleaned_code
                 
+                # For Gradio PRs, only include .py files (preserve existing requirements.txt, etc.)
+                if language == "gradio":
+                    print(f"[PR] Gradio app - filtering to only .py files")
+                    py_files = {fname: content for fname, content in files.items() if fname.endswith('.py')}
+                    if not py_files:
+                        print(f"[PR] Warning: No .py files found in parsed output")
+                        return False, "No Python files found in generated code for Gradio PR", None
+                    files = py_files
+                    print(f"[PR] Will update {len(files)} Python file(s): {list(files.keys())}")
+                
                 # Write files (create subdirectories if needed)
                 for filename, content in files.items():
                     file_path = temp_path / filename
                     file_path.parent.mkdir(parents=True, exist_ok=True)
                     file_path.write_text(content, encoding='utf-8')
                 
-                # Generate requirements.txt if missing for Python apps
-                if language in ["gradio", "streamlit"] and "requirements.txt" not in files:
+                # Skip requirements.txt generation for Gradio PRs (preserve existing)
+                # For Streamlit, generate requirements.txt if missing
+                if language == "streamlit" and "requirements.txt" not in files:
                     main_app = files.get('streamlit_app.py') or files.get('app.py', '')
                     if main_app:
                         print(f"[PR] Generating requirements.txt from imports")