fix(runtime-config): resolver MUSIC_DIR en tiempo de ejecución y no hornearlo en build; endpoints usan env absoluto o public fallback

server/api/music/[filename].get.ts

@@ -1,5 +1,5 @@
 import { promises as fs } from 'fs'
-import { join, resolve, sep } from 'path'
+import { join, resolve, sep, isAbsolute } from 'path'
 import { createReadStream } from 'fs'
 
 export default defineEventHandler(async (event) => {
@@ -30,9 +30,9 @@ export default defineEventHandler(async (event) => {
     
     // Determine the music directory path
     let musicDir: string
-    if (config.musicDirAbs || process.env.MUSIC_DIR) {
-      // Prefer absolute dir from runtimeConfig; fallback to env (resolved relative to repo root at build time)
-      musicDir = (config.musicDirAbs as string) || resolve(process.cwd(), process.env.MUSIC_DIR!)
+    if (process.env.MUSIC_DIR) {
+      // Resolve env to absolute
+      musicDir = isAbsolute(process.env.MUSIC_DIR) ? process.env.MUSIC_DIR : resolve(process.cwd(), process.env.MUSIC_DIR)
     } else {
       // Fallback to public/music
       const defaultPublicPath = config.public?.musicPath || '/music'