feat(music-lab): Phase 2 UI — StemModal, SyncedLyricsPlayer, Style Boost, WAV 변환

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/api.js

@@ -341,6 +341,28 @@ export function generateCoverImage(payload) {
   return apiPost('/api/music/cover-image', payload);
 }
 
+// ── Phase 2 API ─────────────────────────────────────────────────────────────
+
+// POST /api/music/wav  body: { suno_task_id, suno_id, track_id }
+export function convertToWav(payload) {
+  return apiPost('/api/music/wav', payload);
+}
+
+// POST /api/music/stem-split  body: { suno_task_id, suno_id, track_id }
+export function splitStems(payload) {
+  return apiPost('/api/music/stem-split', payload);
+}
+
+// GET /api/music/timestamped-lyrics?task_id=...&suno_id=...
+export function getTimestampedLyrics(taskId, sunoId) {
+  return apiGet(`/api/music/timestamped-lyrics?task_id=${encodeURIComponent(taskId)}&suno_id=${encodeURIComponent(sunoId)}`);
+}
+
+// POST /api/music/style-boost  body: { content }
+export function generateStyleBoost(content) {
+  return apiPost('/api/music/style-boost', { content });
+}
+
 // ── 로또 고도화 API ────────────────────────────────────────────────────────────
 
 // GET /api/lotto/stats/performance