Fix: Include backend/audio Django app in repository

backend/audio/admin.py

@@ -0,0 +1,25 @@
+"""Audio admin"""
+
+from django.contrib import admin
+from audio.models import Audio, AudioProgress
+
+
+@admin.register(Audio)
+class AudioAdmin(admin.ModelAdmin):
+    """Audio admin"""
+    list_display = ('title', 'channel_name', 'duration', 'published_date', 'play_count', 'has_lyrics')
+    list_filter = ('channel_name', 'audio_format', 'published_date')
+    search_fields = ('title', 'channel_name', 'youtube_id')
+    readonly_fields = ('downloaded_date', 'play_count', 'last_played', 'downloaded', 'has_lyrics')
+
+
+@admin.register(AudioProgress)
+class AudioProgressAdmin(admin.ModelAdmin):
+    """Audio progress admin"""
+    list_display = ('user', 'audio', 'position', 'completed', 'last_updated')
+    list_filter = ('completed', 'last_updated')
+    search_fields = ('user__username', 'audio__title')
+
+
+# Import lyrics admin
+from audio.admin_lyrics import *  # noqa