Refactor user and media endpoints: remove unused GetUser and GetMedia methods, streamline AdminUserEndpoints and MediaEndpoints, and enhance metadata handling in MetadataEndpoints. Update Program.cs to remove legacy image relocation logic and improve overall code clarity.

backend/src/TeleWave.Infrastructure/Media/BumperRenderQueue.cs

@@ -1,20 +1,6 @@
-using System.Threading.Channels;
 using TeleWave.Application.Common.Interfaces;
 
 namespace TeleWave.Infrastructure.Media;
 
-/// <summary>Сигнальная очередь-будильник поверх Channel (id ассета — лишь сигнал; работу берём из БД).</summary>
-public sealed class BumperRenderQueue : IBumperRenderQueue
-{
-    private readonly Channel<Guid> _channel = Channel.CreateUnbounded<Guid>(
-        new UnboundedChannelOptions { SingleReader = true }
-    );
-
-    public void Enqueue(Guid assetId) => _channel.Writer.TryWrite(assetId);
-
-    public async ValueTask WaitAsync(CancellationToken cancellationToken)
-    {
-        await _channel.Reader.ReadAsync(cancellationToken);
-        while (_channel.Reader.TryRead(out _)) { }
-    }
-}
+/// <summary>Сигнальная очередь-будильник рендерера заставок (см. <see cref="SignalQueue"/>).</summary>
+public sealed class BumperRenderQueue : SignalQueue, IBumperRenderQueue { }