fix: always regenerate nginx.conf on deploy/update

sources/python/main.py

@@ -79,9 +79,8 @@ docker ps --filter name={container} --format '{{{{.Status}}}}'
 """)
     os.chmod(start_path, 0o755)
 
-    # Nginx config for optional customization
+    # Write nginx.conf (always regenerate to apply template updates)
     nginx_conf = f"{host_dir}/nginx.conf"
-    if not os.path.exists(nginx_conf):
     with open(nginx_conf, "w") as f:
         f.write(f"""# Wallarm node: {name}
 # Mount with: -v $(pwd)/nginx.conf:/etc/nginx/http.d/default.conf:ro