feat(admin): metadata-profile picker on integrations page

Persists the operator's metadata-profile choice alongside quality
profile + root folder. Defaults to the first profile Lidarr returns
(usually 'Standard' on a vanilla install) so the common case is
zero-click; operators with custom profiles like 'Singles only' can pick
explicitly.

Backend:
- Migration 0013: adds nullable default_metadata_profile_id to
  lidarr_config. Existing rows get NULL and the service falls back to
  fetch-and-pick-first until they save.
- Updated lidarr_config queries + sqlc + lidarrconfig.Config + admin
  view/put body to round-trip the new field.
- handlePutLidarrConfig requires it (along with QP and root folder)
  when enabled=true — matches the existing missing_defaults gate.
- New GET /api/admin/lidarr/metadata-profiles handler + lidarr.Client
  ListMetadataProfiles (GET /api/v1/metadataprofile, same shape as
  the quality-profile endpoint).
- lidarrrequests.Approve prefers cfg.DefaultMetadataProfileID; falls
  back to the fetch-list path only when 0 (back-compat for upgraders).

Frontend:
- LidarrConfig type + LidarrMetadataProfile type + qk.lidarrMetadataProfiles.
- listMetadataProfiles + createMetadataProfilesQuery client helpers.
- Integrations page: third <select> picker, auto-defaults to first
  profile when the saved value is 0, sends the new field on save and
  clears it on disconnect.
- Updated test fixtures + the duplicate 'Standard' option string in
  the dropdown-populates assertion.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

internal/lidarrconfig/service.go

@@ -15,11 +15,12 @@ import (
 // Config is the typed projection of lidarr_config (no NULL fields exposed
 // to callers — empty strings / zero ints carry the "unset" meaning).
 type Config struct {
-	Enabled                 bool
-	BaseURL                 string
-	APIKey                  string
-	DefaultQualityProfileID int
-	DefaultRootFolderPath   string
+	Enabled                  bool
+	BaseURL                  string
+	APIKey                   string
+	DefaultQualityProfileID  int
+	DefaultMetadataProfileID int
+	DefaultRootFolderPath    string
 }
 
 // Service reads and writes the singleton.
@@ -44,6 +45,9 @@ func (s *Service) Get(ctx context.Context) (Config, error) {
 	if row.DefaultQualityProfileID != nil {
 		cfg.DefaultQualityProfileID = int(*row.DefaultQualityProfileID)
 	}
+	if row.DefaultMetadataProfileID != nil {
+		cfg.DefaultMetadataProfileID = int(*row.DefaultMetadataProfileID)
+	}
 	if row.DefaultRootFolderPath != nil {
 		cfg.DefaultRootFolderPath = *row.DefaultRootFolderPath
 	}
@@ -57,14 +61,16 @@ func (s *Service) Save(ctx context.Context, cfg Config) error {
 		baseURL  = strPtr(cfg.BaseURL)
 		apiKey   = strPtr(cfg.APIKey)
 		qpID     = int32Ptr(cfg.DefaultQualityProfileID)
+		mpID     = int32Ptr(cfg.DefaultMetadataProfileID)
 		rootPath = strPtr(cfg.DefaultRootFolderPath)
 	)
 	_, err := dbq.New(s.pool).UpdateLidarrConfig(ctx, dbq.UpdateLidarrConfigParams{
-		Enabled:                 cfg.Enabled,
-		BaseUrl:                 baseURL,
-		ApiKey:                  apiKey,
-		DefaultQualityProfileID: qpID,
-		DefaultRootFolderPath:   rootPath,
+		Enabled:                  cfg.Enabled,
+		BaseUrl:                  baseURL,
+		ApiKey:                   apiKey,
+		DefaultQualityProfileID:  qpID,
+		DefaultMetadataProfileID: mpID,
+		DefaultRootFolderPath:    rootPath,
 	})
 	if err != nil {
 		return fmt.Errorf("lidarrconfig: %w", err)