feat: fetch all artist albums with caching, filter by type in handler

- Provider fetches all release groups via paginated browse, no type filter
- Service caches all albums in DB, ensures referenced artists exist first
- Server handler filters by album_types (default: album|ep|single), excludes secondary types
- Add secondary_types to domain, DB schema, and MB types
- Add ErrBadRequest handling for MusicBrainz 400 errors
- Replace migrations with single schema.sql
- Add GetAllByArtistID and SaveAll to album repository

internal/provider/musicbrainz/client.go

@@ -107,6 +107,12 @@ func (c *client) readResponse(ctx context.Context, resp *http.Response, endpoint
 		metrics.ProviderRequests.WithLabelValues("musicbrainz", endpoint, "ok").Inc()
 		return io.ReadAll(resp.Body)
 
+	case http.StatusBadRequest:
+		body, _ := io.ReadAll(resp.Body)
+		log.Warn().Str("endpoint", endpoint).Str("body", string(body)).Dur("duration", duration).Msg("HTTP 400 bad request")
+		metrics.ProviderRequests.WithLabelValues("musicbrainz", endpoint, "bad_request").Inc()
+		return nil, fmt.Errorf("%w: %s", ErrBadRequest, extractErrorMessage(body))
+
 	case http.StatusNotFound:
 		log.Debug().Str("endpoint", endpoint).Dur("duration", duration).Msg("HTTP 404")
 		metrics.ProviderRequests.WithLabelValues("musicbrainz", endpoint, "not_found").Inc()
@@ -137,17 +143,12 @@ func (c *client) lookup(ctx context.Context, entity, id string, inc []string) ([
 }
 
 func (c *client) browse(ctx context.Context, entity, linkedEntity, linkedID string, limit, offset int, inc []string) ([]byte, error) {
-	return c.browseWithTypes(ctx, entity, linkedEntity, linkedID, limit, offset, inc, nil)
-}
-
-func (c *client) browseWithTypes(ctx context.Context, entity, linkedEntity, linkedID string, limit, offset int, inc []string, types []string) ([]byte, error) {
 	zerolog.Ctx(ctx).Debug().
 		Str("entity", entity).
 		Str("linked_entity", linkedEntity).
 		Str("linked_id", linkedID).
 		Int("limit", limit).
 		Int("offset", offset).
-		Strs("types", types).
 		Msg("provider browse")
 
 	params := url.Values{}
@@ -159,10 +160,6 @@ func (c *client) browseWithTypes(ctx context.Context, entity, linkedEntity, link
 		params.Set("inc", joined)
 	}
 
-	if typeStr := strings.Join(types, "|"); typeStr != "" {
-		params.Set("type", typeStr)
-	}
-
 	return c.get(ctx, entity, params)
 }
 
@@ -184,6 +181,16 @@ func joinIncludes(inc []string) string {
 	return strings.Join(inc, "+")
 }
 
+func extractErrorMessage(body []byte) string {
+	var errResp struct {
+		Error string `json:"error"`
+	}
+	if json.Unmarshal(body, &errResp) == nil && errResp.Error != "" {
+		return errResp.Error
+	}
+	return string(body)
+}
+
 func decode[T any](data []byte) (*T, error) {
 	var result T
 	if err := json.Unmarshal(data, &result); err != nil {