feat: add Reverb realtime messaging

docs/realtime-messaging.md

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+# Realtime Messaging
+
+Skinbase Nova messaging now uses Laravel Reverb, Laravel Broadcasting, Laravel Echo, and Redis-backed queues.
+
+## Local setup
+
+1. Set the Reverb and Redis values in `.env`.
+2. Run `php artisan migrate`.
+3. Run `npm install` if dependencies are not installed.
+4. Start the websocket server with `php artisan reverb:start --host=0.0.0.0 --port=8080`.
+5. Start queue workers with `php artisan queue:work redis --queue=broadcasts,default,notifications --tries=1`.
+6. Start the frontend with `npm run dev` or build assets with `npm run build`.
+
+## Production notes
+
+- Use `BROADCAST_CONNECTION=reverb` and `QUEUE_CONNECTION=redis`.
+- Keep `MESSAGING_REALTIME=true` only when Reverb is configured and reachable from the browser.
+- Terminate TLS in Nginx and proxy websocket traffic to the Reverb process.
+- Run both `php artisan reverb:start` and `php artisan queue:work redis --queue=broadcasts,default,notifications --tries=1` under Supervisor or systemd.
+- The chat UI falls back to HTTP polling only when realtime is disabled in config.
+
+## Reconnect model
+
+- The conversation view loads once via HTTP.
+- Live message, read, and typing updates arrive over websocket channels.
+- When the socket reconnects, the client requests message deltas with `after_id` to merge missed messages idempotently.