Sync API metadata endpoints with the full Web UI metadata refresh

The REST API sync endpoints (/api/v1/media/.../sync/ and season/episode
variants) only ever updated title/original_title/localized_title/image,
while the Web UI's "Sync metadata with provider" action also refreshes
genres, core/provider metadata fields, metadata_fetched_at, provider
links, credits, Trakt popularity, and game lengths.

Extract the Web UI's enrichment logic into a shared
enrich_synced_item() and call it from MediaSyncView and
MediaSeasonSyncView (MediaEpisodeSyncView delegates to the latter) so
API syncs match the Web UI's behavior.

Fixes #905

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019CLHUQmKMadyJFkreJ9ViB

Author: claude

src/api/views.py

@@ -25,6 +25,7 @@
     get_next_episode_map,
     parse_media_list_filters,
 )
+from app.metadata_sync_views import enrich_synced_item
 from app.models import BasicMedia, Item, MediaTypes, Sources
 from app.providers import services, tmdb
 from app.services import metadata_resolution
@@ -2145,6 +2146,22 @@ def post(self, request, media_type, source, media_id):  # FORK: was `_`
                 Item.objects.filter(pk=item.pk).update(**item_fields)
                 item.refresh_from_db()
 
+            sync_warnings, _preferred_provider_synced = enrich_synced_item(
+                item,
+                metadata,
+                source=source,
+                route_media_type=media_type,
+                tracking_media_type=media_type,
+                season_number=None,
+                user=request.user,
+            )
+            for sync_warning in sync_warnings:
+                logger.warning(
+                    "metadata_sync_partial_failure item_id=%s warning=%s",
+                    item.id,
+                    sync_warning,
+                )
+
             item.fetch_releases(delay=False)
 
             return Response(
@@ -3227,6 +3244,22 @@ def post(self, request, media_type, source, media_id, season_number):
                 Item.objects.filter(pk=item.pk).update(**item_fields)
                 item.refresh_from_db()
 
+            sync_warnings, _preferred_provider_synced = enrich_synced_item(
+                item,
+                metadata,
+                source=source,
+                route_media_type=MediaTypes.SEASON.value,
+                tracking_media_type=MediaTypes.SEASON.value,
+                season_number=season_number,
+                user=request.user,
+            )
+            for sync_warning in sync_warnings:
+                logger.warning(
+                    "metadata_sync_partial_failure item_id=%s warning=%s",
+                    item.id,
+                    sync_warning,
+                )
+
             metadata["episodes"] = tmdb.process_episodes(
                 metadata,
                 [],