Add ACE-Step music generation to the studio and library.

Co-authored-by: Cursor <cursoragent@cursor.com>

server/api/library/tracks/[id].delete.ts

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+export default defineEventHandler(async (event) => {
+  const { owner } = assertLibraryOwner(event)
+  const id = String(getRouterParam(event, 'id') || '')
+  const track = getTrack(owner, id)
+  assertFolderAccess(event, track.folderId)
+  await deleteTrack(owner, id)
+  return { ok: true }
+})

server/api/library/tracks/[id].patch.ts

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+export default defineEventHandler(async (event) => {
+  const { owner } = assertLibraryOwner(event)
+  const id = String(getRouterParam(event, 'id') || '')
+  const body = await readBody<{ folderId?: string; name?: string }>(event).catch(() => ({} as { folderId?: string; name?: string }))
+  const folderId = String(body?.folderId || '')
+  const hasName = typeof body?.name === 'string'
+  if (!folderId && !hasName) {
+    throw createError({ statusCode: 400, statusMessage: 'Choose a library folder or a new name' })
+  }
+  const track = getTrack(owner, id)
+  assertFolderAccess(event, track.folderId)
+  if (folderId) {
+    assertFolderExists(event, folderId)
+    await moveTrack(owner, id, folderId)
+  }
+  if (hasName) await renameTrack(owner, id, body.name || '')
+  return publicLibrary(event)
+})

server/api/library/tracks/[id]/audio.get.ts

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+import { existsSync } from 'node:fs'
+import { sendPathWithRange } from '~/server/utils/httpRange'
+import { musicContentType } from '~/utils/music'
+
+export default defineEventHandler((event) => {
+  const { owner } = assertLibraryOwner(event)
+  const id = String(getRouterParam(event, 'id') || '')
+  const track = getTrack(owner, id)
+  assertFolderAccess(event, track.folderId)
+  const path = trackAudioPath(owner, track.id, track.ext)
+  if (!existsSync(path)) {
+    throw createError({ statusCode: 404, statusMessage: 'Audio file is missing' })
+  }
+  const ext = track.ext || 'flac'
+  return sendPathWithRange(event, path, musicContentType(ext), {
+    'Content-Disposition': `inline; filename="${safeDownloadName(track.name)}.${ext}"`,
+    'Cache-Control': 'private, max-age=0, must-revalidate'
+  })
+})