chore: import MusifyBackend into monorepo (preserving history)

git-subtree-dir: MusifyBackend
git-subtree-mainline: 6829e769ed
git-subtree-split: ed7b00c2cc

MusifyBackend/Application/PlayLists/Commands/AddTrackToPlayListCommand.cs

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+using Ardalis.Result;
+using Mediator;
+
+namespace Musify.Application.PlayLists.Commands
+{
+    public record AddTrackToPlayListCommand(long UserId, Guid PlayListId, Guid TrackId)
+        : ICommand<Result>;
+}

MusifyBackend/Application/PlayLists/Commands/CreatePlayListCommand.cs

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+using Ardalis.Result;
+using Mediator;
+using Musify.Application.PlayLists.Responses;
+
+namespace Musify.Application.PlayLists.Commands
+{
+    public record CreatePlayListCommand(
+        long UserId,
+        string Name,
+        string Description,
+        Guid? PictureIntentId)
+        : ICommand<Result<PlayListApplicationResponse>>;
+}

MusifyBackend/Application/PlayLists/Commands/DeletePlayListCommand.cs

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+using Ardalis.Result;
+using Mediator;
+
+namespace Musify.Application.PlayLists.Commands
+{
+    public record DeletePlayListCommand(long UserId, Guid PlayListId)
+        : ICommand<Result>;
+}

MusifyBackend/Application/PlayLists/Commands/RemoveTrackFromPlayListCommand.cs

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+using Ardalis.Result;
+using Mediator;
+
+namespace Musify.Application.PlayLists.Commands
+{
+    public record RemoveTrackFromPlayListCommand(long UserId, Guid PlayListId, Guid TrackId)
+        : ICommand<Result>;
+}

MusifyBackend/Application/PlayLists/Commands/RequestPlayListPictureUploadCommand.cs

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+using Ardalis.Result;
+using Mediator;
+using Musify.Application.PlayLists.Responses;
+
+namespace Musify.Application.PlayLists.Commands
+{
+    public record RequestPlayListPictureUploadCommand(
+        long UserId,
+        string FileType,
+        string ContentType,
+        long? ExpectedSizeBytes = null)
+        : ICommand<Result<PlayListPictureUploadResponse>>;
+}

MusifyBackend/Application/PlayLists/Commands/UpdatePlayListCommand.cs

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+using Ardalis.Result;
+using Mediator;
+using Musify.Application.PlayLists.Responses;
+
+namespace Musify.Application.PlayLists.Commands
+{
+    public record UpdatePlayListCommand(
+        long UserId,
+        Guid PlayListId,
+        string? NewName,
+        string? NewDescription,
+        Guid? NewPictureIntentId)
+        : ICommand<Result<PlayListApplicationResponse>>;
+}