chore: remove React frontend, rename frontend-leptos to frontend

services/frontend/.env.example

@@ -1,5 +1,3 @@
-# Backend API URL (default: http://localhost:3001)
+# API/WS endpoints — set these before building
 VITE_BE_API_URL=http://localhost:3001
-
-# Backend WebSocket URL (default: ws://localhost:3001)
-VITE_BE_WS_URL=ws://localhost:3001
+VITE_BE_WS_URL=ws://localhost:3001/ws