Update frontend/.env.example via Son of Anton

frontend/.env.example

-# ============================================
-# THE GRIND — Frontend Environment Variables
-# ============================================
-
-# Backend API URL (internal, for SSR)
 NEXT_PUBLIC_API_URL=http://localhost:3001/api
-
-# Backend WebSocket URL (for Socket.io client)
+NEXT_PUBLIC_WS_URL=http://localhost:3001
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-NEXT_PUBLIC_WS_URL=http://localhost:3001
-
-# Public URL of this frontend (used for generating links)
-NEXT_PUBLIC_APP_URL=http://localhost:3000
-
-# MinIO public URL (for serving uploaded files/images)
-NEXT_PUBLIC_MINIO_URL=http://localhost:9000
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