chore: import MusifyBackend into monorepo (preserving history)

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

MusifyBackend/Application/Users/Handlers/GetUserByIdQueryHandler.cs

@@ -0,0 +1,26 @@
+using Ardalis.Result;
+using Mediator;
+using Microsoft.EntityFrameworkCore;
+using Musify.Application.Contracts;
+using Musify.Application.Users.Queries;
+using Musify.Application.Users.Responses;
+
+namespace Musify.Application.Users.Handlers
+{
+    public class GetUserByIdQueryHandler(IDatabase database)
+        : IQueryHandler<GetUserByIdQuery, Result<UserApplicationResponse> >
+    {
+        public async ValueTask<Result<UserApplicationResponse>> Handle(GetUserByIdQuery request, CancellationToken cancellationToken)
+        {
+            var user = await database.Users
+                .AsNoTracking()
+                .Where(u => u.Id == request.Id)
+                .Select(u => UserApplicationResponse.FromEntity(u))
+                .SingleOrDefaultAsync(cancellationToken);
+
+            return user is null
+                ? Result<UserApplicationResponse>.NotFound()
+                : Result.Success(user);
+        }
+    }
+}