fix: nginx audio mime types

ai/nginx.conf.template

@@ -3,6 +3,10 @@ events {
 }
 
 http {
+    # MIME types
+    include /etc/nginx/mime.types;
+    default_type application/octet-stream;
+
     # Proxy settings
     proxy_http_version 1.1;
     proxy_buffering off;
@@ -28,6 +32,21 @@ http {
         # Increase client body size for image uploads
         client_max_body_size 100M;
 
+        # Audio files - fix Content-Type for browser playback
+        location ~ \.wav$ {
+            proxy_pass http://${GPU_SERVICE_HOST}:${GPU_SERVICE_PORT};
+            proxy_hide_header Content-Type;
+            add_header Content-Type "audio/wav";
+            proxy_hide_header Content-Disposition;
+        }
+
+        location ~ \.mp3$ {
+            proxy_pass http://${GPU_SERVICE_HOST}:${GPU_SERVICE_PORT};
+            proxy_hide_header Content-Type;
+            add_header Content-Type "audio/mpeg";
+            proxy_hide_header Content-Disposition;
+        }
+
         location / {
             # Proxy to service on RunPod via Tailscale
             proxy_pass http://${GPU_SERVICE_HOST}:${GPU_SERVICE_PORT};