feat(phase3b): 마이페이지 음악 영상화 신청·상태 + 모달 트랙 연결

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01AAtcmKKtqDUe4NyVgy1aLQ

app/api/studio/tracks/route.ts

@@ -41,7 +41,7 @@ export async function GET() {
   // 세션 클라이언트로 본인 것만(RLS music_select_own)
   const { data, error } = await supabase
     .from('music_tracks')
-    .select('id, title, story, lyrics, style, audio_url, task_id, created_at')
+    .select('id, title, story, lyrics, style, audio_url, task_id, created_at, video_status, video_url')
     .order('created_at', { ascending: false });
 
   if (error) return NextResponse.json({ error: error.message }, { status: 500 });