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

nuxt.config.ts

@@ -1,10 +1,5 @@
 // https://nuxt.com/docs/api/configuration/nuxt-config
 import { defineNuxtConfig } from 'nuxt/config'
-import { resolve, isAbsolute } from 'path'
-
-// Compute absolute music directory at build-time to avoid .output cwd issues in preview/prod
-const musicDirEnv = process.env.MUSIC_DIR || './music'
-const musicDirAbs = isAbsolute(musicDirEnv) ? musicDirEnv : resolve(process.cwd(), musicDirEnv)
 
 export default defineNuxtConfig({
   // Helpers
@@ -144,7 +139,6 @@ export default defineNuxtConfig({
   
   // Runtime configuration
   runtimeConfig: {
-    musicDirAbs,
     public: {
       musicPath: process.env.NUXT_PUBLIC_MUSIC_PATH || '/music'
     }