Add audio parameter to player playlist and auto-mark deployment status

- api.py: include 'audio' (on/off) field in playlist JSON served to players,
  derived from the muted toggle in the manage playlist page
- players.py: include 'audio' field in legacy player playlist builder
- api.py: auto-flip deployment_status pending/deploying -> deployed when a
  player sends feedback (player is confirmed running)
- players_list.html: poll deployment status for pending/failed badges so the
  players list live-updates once a player starts sending feedback
- .dockerignore: exclude runtime data/ volume dir from build context

app/blueprints/api.py

@@ -413,7 +413,12 @@ def get_cached_playlist(player_id: int) -> List[Dict]:
             'position': content._playlist_position or idx,
             'url': item_url,  # Web page URL for weblinks, file download URL otherwise
             'description': content.description,
-            'edit_on_player': getattr(content, '_playlist_edit_on_player_enabled', False)
+            'edit_on_player': getattr(content, '_playlist_edit_on_player_enabled', False),
+            'muted': getattr(content, '_playlist_muted', True),
+            # Player expects 'audio' = "on"/"off" to set playback sound.
+            # The playlist_content.muted column stores True when audio is muted,
+            # so audio is "on" exactly when muted is False.
+            'audio': 'off' if getattr(content, '_playlist_muted', True) else 'on'
         })
     
     return playlist_data
@@ -502,6 +507,18 @@ def receive_player_feedback():
         player.last_seen = datetime.utcnow()
         player.status = status
         
+        # A player that is sending feedback is running, so its deployment
+        # finished successfully. Auto-mark it as deployed so the players list
+        # doesn't stay stuck on "pending"/"deploying" after deployment is done.
+        if player.deployment_status in ('pending', 'deploying'):
+            player.deployment_status = 'deployed'
+            player.last_deployment_status = 'success'
+            player.last_deployment_message = (
+                'Player is running and sending feedback'
+            )
+            if not player.last_deployment_at:
+                player.last_deployment_at = datetime.utcnow()
+        
         db.session.commit()
         
         log_action('info', f'Feedback received from {player.name} ({player.hostname}): {status} - {message}')