Fix deploy: main.py entrypoint and proxy Dockerfile for VPN build

Co-authored-by: Cursor <cursoragent@cursor.com>

main.py

@@ -0,0 +1,25 @@
+"""Entry point for container: python main.py"""
+import subprocess
+import sys
+
+
+def main() -> None:
+    subprocess.run(
+        [
+            sys.executable,
+            "-m",
+            "gunicorn",
+            "-b",
+            "0.0.0.0:8765",
+            "-w",
+            "2",
+            "--timeout",
+            "180",
+            "run:app",
+        ],
+        check=True,
+    )
+
+
+if __name__ == "__main__":
+    main()