feat: add VITE_PUSHER environment variables for frontend WebSocket

Configure browser to connect to Soketi via HTTPS through Traefik:
- VITE_PUSHER_HOST: coolify-realtime.coolify.dev.pivoine.art
- VITE_PUSHER_PORT: 443
- VITE_PUSHER_SCHEME: https

This fixes the 'Cannot connect to real-time service' warning.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

dev/compose.yaml

@@ -118,6 +118,10 @@ services:
       - PUSHER_APP_ID=${DEV_COOLIFY_PUSHER_APP_ID}
       - PUSHER_APP_KEY=${DEV_COOLIFY_PUSHER_APP_KEY}
       - PUSHER_APP_SECRET=${DEV_COOLIFY_PUSHER_APP_SECRET}
+      - VITE_PUSHER_APP_KEY=${DEV_COOLIFY_PUSHER_APP_KEY}
+      - VITE_PUSHER_HOST=coolify-realtime.${DEV_COOLIFY_TRAEFIK_HOST}
+      - VITE_PUSHER_PORT=443
+      - VITE_PUSHER_SCHEME=https
       - SSL_MODE=off
     networks:
       - compose_network