fix: rendre le proxy MIZIK plus robuste et tolérer l'ancien nommage des credentials

app/api/mizik-stream/[id]/route.js

@@ -1,6 +1,8 @@
 const MIZIK_URL = process.env.NEXT_PUBLIC_OKI_MIZIK_URL || 'https://funkwhale-server.com'
-const MIZIK_API_USER = process.env.MIZIK_API_USER || 'user'
-const MIZIK_API_PASSWORD = process.env.MIZIK_API_PASSWORD || 'password'
+// Les variables publiques sont conservées en fallback pendant la migration
+// des déploiements qui utiliseraient encore l’ancien nommage.
+const MIZIK_API_USER = process.env.MIZIK_API_USER || process.env.NEXT_PUBLIC_MIZIK_API_USER || 'user'
+const MIZIK_API_PASSWORD = process.env.MIZIK_API_PASSWORD || process.env.NEXT_PUBLIC_MIZIK_API_PASSWORD || 'password'
 
 const FORWARDED_HEADERS = ['content-type', 'content-length', 'content-range', 'accept-ranges']
 
@@ -14,6 +16,12 @@ export async function GET(request, props) {
     headers: range ? {range} : {}
   })
 
+  if (!upstreamResponse.ok) {
+    const message = `Le serveur audio a répondu ${upstreamResponse.status}`
+    console.error(message, upstreamUrl.replace(/p=[^&]+/, 'p=***'))
+    return Response.json({error: message}, {status: upstreamResponse.status})
+  }
+
   const headers = new Headers()
   for (const key of FORWARDED_HEADERS) {
     const value = upstreamResponse.headers.get(key)