Add broadcast scheduling features: implement Show and Channel entities, enhance AppDbContext and DependencyInjection for broadcasting, and update API routing. Include migration for new database schema and update documentation for broadcast-related functionalities.

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

@@ -0,0 +1,29 @@
+using TeleWave.Domain.Library;
+using TeleWave.Domain.Media;
+
+namespace TeleWave.Application.Library;
+
+public sealed record ShowSummaryDto(
+    Guid Id,
+    string Name,
+    ShowKind Kind,
+    int EpisodeCount,
+    DateTimeOffset CreatedAt
+);
+
+public sealed record EpisodeDto(
+    Guid Id,
+    Guid MediaAssetId,
+    int Position,
+    string? AssetName,
+    MediaAssetStatus? AssetStatus,
+    double? DurationSeconds
+);
+
+public sealed record ShowDto(
+    Guid Id,
+    string Name,
+    ShowKind Kind,
+    string? Description,
+    IReadOnlyList<EpisodeDto> Episodes
+);