Add torrent client integration and downloads management: introduce qbittorrent service in Docker setup, implement downloads endpoint in API, and enhance media storage to handle imported files. Update frontend routes and translations for downloads management.

backend/src/TeleWave.Application/Media/Downloads/DownloadFileDto.cs

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+namespace TeleWave.Application.Media.Downloads;
+
+public sealed record DownloadFileDto(string RelativePath, string Name, long SizeBytes);

backend/src/TeleWave.Application/Media/Downloads/ListDownloadsQuery.cs

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+using LiteCqrs;
+
+namespace TeleWave.Application.Media.Downloads;
+
+public sealed record ListDownloadsQuery : IQuery<IReadOnlyList<DownloadFileDto>>;

backend/src/TeleWave.Application/Media/Downloads/ListDownloadsQueryHandler.cs

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+using LiteCqrs;
+using TeleWave.Application.Common.Interfaces;
+
+namespace TeleWave.Application.Media.Downloads;
+
+public sealed class ListDownloadsQueryHandler(IMediaStorage storage)
+    : IQueryHandler<ListDownloadsQuery, IReadOnlyList<DownloadFileDto>>
+{
+    public Task<IReadOnlyList<DownloadFileDto>> Handle(
+        ListDownloadsQuery query,
+        CancellationToken cancellationToken
+    )
+    {
+        IReadOnlyList<DownloadFileDto> files = storage
+            .ListDownloads()
+            .Select(d => new DownloadFileDto(d.RelativePath, d.Name, d.SizeBytes))
+            .ToList();
+        return Task.FromResult(files);
+    }
+}