feat: Add real-time quiz lobby functionality

- Implement WebSocket-based lobby system for quiz participants
- Add lobby page with real-time participant updates
- Create LobbyConsumer for WebSocket communication
- Add routing configuration for WebSocket connections
- Update requirements with WebSocket dependencies
- Add development and production server documentation

This change enables real-time quiz lobbies where participants can
join and wait for the quiz to start, with instant updates for all
connected users.

django/play/migrations/0005_quizgameparticipant_last_heartbeat.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.1.7 on 2025-04-05 12:23
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('play', '0004_remove_quizgame_host_user_quizgame_host_id'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='quizgameparticipant',
+            name='last_heartbeat',
+            field=models.DateTimeField(auto_now=True),
+        ),
+    ]