feat: YouTube music download system with admin dashboard

Sidecar architecture: edge functions (auth + DB) → youtube-worker container
(youtubei.js for playlist metadata, yt-dlp for audio downloads).

- Edge functions: youtube-playlist, youtube-process, youtube-status (CRUD)
- youtube-worker sidecar: Node.js + yt-dlp, downloads M4A to Supabase Storage
- Admin music page: import playlists, process queue, inline genre editing
- 12 music genres with per-track assignment and import-time defaults
- DB migrations: download_jobs, download_items tables with genre column
- Deploy script and CI workflow for edge functions + sidecar

admin-web/lib/supabase.ts

@@ -34,6 +34,28 @@ export type Json =
   | { [key: string]: Json | undefined }
   | Json[]
 
+export const MUSIC_GENRES = [
+  'edm', 'hip-hop', 'pop', 'rock', 'latin', 'house',
+  'drum-and-bass', 'dubstep', 'r-and-b', 'country', 'metal', 'ambient',
+] as const
+
+export type MusicGenre = typeof MUSIC_GENRES[number]
+
+export const GENRE_LABELS: Record<MusicGenre, string> = {
+  'edm': 'EDM',
+  'hip-hop': 'Hip Hop',
+  'pop': 'Pop',
+  'rock': 'Rock',
+  'latin': 'Latin',
+  'house': 'House',
+  'drum-and-bass': 'Drum & Bass',
+  'dubstep': 'Dubstep',
+  'r-and-b': 'R&B',
+  'country': 'Country',
+  'metal': 'Metal',
+  'ambient': 'Ambient',
+}
+
 export interface Database {
   public: {
     Tables: {
@@ -137,6 +159,47 @@ export interface Database {
           last_login: string | null
         }
       }
+      download_jobs: {
+        Row: {
+          id: string
+          playlist_url: string
+          playlist_title: string | null
+          status: 'pending' | 'processing' | 'completed' | 'failed'
+          total_items: number
+          completed_items: number
+          failed_items: number
+          created_by: string
+          created_at: string
+          updated_at: string
+        }
+        Insert: {
+          id?: string
+          playlist_url: string
+          playlist_title?: string | null
+          status?: 'pending' | 'processing' | 'completed' | 'failed'
+          total_items?: number
+          completed_items?: number
+          failed_items?: number
+          created_by: string
+        }
+        Update: Partial<Omit<Database['public']['Tables']['download_jobs']['Insert'], 'id'>>
+      }
+      download_items: {
+        Row: {
+          id: string
+          job_id: string
+          video_id: string
+          title: string | null
+          duration_seconds: number | null
+          thumbnail_url: string | null
+          status: 'pending' | 'downloading' | 'completed' | 'failed'
+          storage_path: string | null
+          public_url: string | null
+          error_message: string | null
+          genre: MusicGenre | null
+          created_at: string
+        }
+      }
     }
   }
 }