fix: add main() function and __main__ guard to server/app.py

server/app.py

@@ -1,5 +1,21 @@
 """
-server/app.py — Required by OpenEnv multi-mode deployment standard.
-Re-exports the FastAPI app and main entry point from the root api module.
+server/app.py — OpenEnv multi-mode deployment entry point.
+Required by the OpenEnv standard for server-mode deployment.
 """
-from api import app, main  # noqa: F401
+import sys
+import os
+
+# Ensure root directory is importable
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+
+from api import app  # noqa: F401
+
+
+def main():
+    """Server entry point called by 'server' script in pyproject.toml."""
+    import uvicorn
+    uvicorn.run("server.app:app", host="0.0.0.0", port=7860)
+
+
+if __name__ == "__main__":
+    main()