Add metadata management for shows: implement metadata retrieval, application, and updates in the API and UI. Enhance Show and ShowDto models to include metadata fields, and update the database schema accordingly. Introduce new endpoints for metadata operations and integrate metadata display in the ShowDetail component.

backend/src/TeleWave.Application/Library/ShowDtos.cs

@@ -9,6 +9,8 @@ public sealed record ShowSummaryDto(
     ShowKind Kind,
     int EpisodeCount,
     int SeasonCount,
+    int? Year,
+    bool HasPoster,
     DateTimeOffset CreatedAt
 );
 
@@ -26,5 +28,9 @@ public sealed record ShowDto(
     string Name,
     ShowKind Kind,
     string? Description,
+    string? MetadataProvider,
+    string? MetadataExternalId,
+    int? Year,
+    bool HasPoster,
     IReadOnlyList<EpisodeDto> Episodes
 );