The api.caterium.ru PHP reverse proxy has been deployed and verified end-to-end
(curl tests plus live authenticated RPC calls through a real browser session).
This switches the client's Supabase fetch calls to go through the proxy so
requests from Russia work without a VPN. Realtime's WebSocket connection is
unaffected since it doesn't go through fetch.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>