Fix musicbrainz test button

core/connection_test.py

@@ -379,6 +379,16 @@ def run_service_test(service, test_config):
                 return False, "Hydrabase not connected. Configure URL + API key and click Connect."
             except Exception as e:
                 return False, f"Hydrabase connection error: {str(e)}"
+        elif service == "musicbrainz":
+            try:
+                from core.metadata.registry import get_musicbrainz_client
+                mb = get_musicbrainz_client()
+                results = mb.search_artists("radiohead", limit=1)
+                if results:
+                    return True, "MusicBrainz reachable"
+                return False, "MusicBrainz returned no results — may be rate-limited or unreachable."
+            except Exception as e:
+                return False, f"MusicBrainz connection error: {str(e)}"
         elif service == "soundcloud":
             # Anonymous SoundCloud has no auth, so "test" really means
             # "is yt-dlp installed and can it reach SoundCloud right now."

web_server.py

@@ -1859,6 +1859,7 @@ SERVICE_CONFIG_REGISTRY = {
     'spotify':      {'required': ['client_id', 'client_secret']},
     'itunes':       {'always': True},   # default storefront works anon
     'deezer':       {'always': True},   # anon search works, premium ARL is optional
+    'musicbrainz':  {'always': True},   # public API, no credentials required
     'amazon':       {'always': True},   # T2Tunes proxy, no credentials required
     'discogs':      {'required': ['token']},
     'tidal':        {'custom': lambda _svc: _tidal_has_auth_token()},