fix: server entry point uses main() function as required by multi-mode validator

pyproject.toml

@@ -16,4 +16,4 @@ dependencies = [
 ]
 
 [project.scripts]
-server = "app:app"
+server = "server.app:main"

server/app.py

@@ -13,6 +13,11 @@ sys.path.insert(0, os.path.join(os.path.dirname(__file__), ".."))
 
 from app import app  # noqa: F401 — re-export for uvicorn
 
-if __name__ == "__main__":
+
+def main():
     import uvicorn
     uvicorn.run("server.app:app", host="0.0.0.0", port=7860, reload=False)
+
+
+if __name__ == "__main__":
+    main()