feat(voice): add WebRTC voice channels with Cloudflare TURN support

Add voice channel functionality with WebRTC peer-to-peer audio:
- Add VoiceSignalingConsumer for WebRTC signaling and peer coordination
- Add GlobalConsumer for real-time presence and voice status updates
- Add voice channel type to Channel model with current_voice_channel tracking on UserProfile
- Add voice controls UI (mute, deafen, disconnect) in status panel
- Add voice member list display in sidebar with avatar support
- Add

chat/models.py

@@ -15,6 +15,7 @@ class UserProfile(models.Model):
     role = models.CharField(max_length=20, choices=ROLE_CHOICES, default='user')
     blocked_users = models.ManyToManyField(User, related_name='blocked_by', blank=True)
     online = models.BooleanField(default=False)
+    current_voice_channel = models.ForeignKey('Channel', on_delete=models.SET_NULL, null=True, blank=True, related_name='voice_members')
 
     def __str__(self):
         return f'{self.user.username} ({self.role})'
@@ -27,8 +28,13 @@ class UserProfile(models.Model):
 
 
 class Channel(models.Model):
+    CHANNEL_TYPES = [
+        ('text', 'Text Channel'),
+        ('voice', 'Voice Channel'),
+    ]
     name = models.CharField(max_length=100, unique=True)
     description = models.TextField(blank=True, default='')
+    channel_type = models.CharField(max_length=10, choices=CHANNEL_TYPES, default='text')
     created_by = models.ForeignKey(User, on_delete=models.SET_NULL, null=True, related_name='created_channels')
     members = models.ManyToManyField(User, related_name='channels', blank=True)
     created_at = models.DateTimeField(auto_now_add=True)