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/ListShows/ListShowsQuery.cs

@@ -0,0 +1,5 @@
+using LiteCqrs;
+
+namespace TeleWave.Application.Library.ListShows;
+
+public sealed record ListShowsQuery : IQuery<IReadOnlyList<ShowSummaryDto>>;

backend/src/TeleWave.Application/Library/ListShows/ListShowsQueryHandler.cs

@@ -0,0 +1,20 @@
+using LiteCqrs;
+using Microsoft.EntityFrameworkCore;
+using TeleWave.Application.Common.Interfaces;
+
+namespace TeleWave.Application.Library.ListShows;
+
+public sealed class ListShowsQueryHandler(IAppDbContext dbContext)
+    : IQueryHandler<ListShowsQuery, IReadOnlyList<ShowSummaryDto>>
+{
+    public async Task<IReadOnlyList<ShowSummaryDto>> Handle(
+        ListShowsQuery query,
+        CancellationToken cancellationToken
+    )
+    {
+        return await dbContext.Shows.AsNoTracking()
+            .OrderBy(s => s.Name)
+            .Select(s => new ShowSummaryDto(s.Id, s.Name, s.Kind, s.Episodes.Count, s.CreatedAt))
+            .ToListAsync(cancellationToken);
+    }
+}