fix: resolve DI failure in GetUserProfileQueryHandler by using IDbContextFactory

src/NexusReader.Application/Queries/User/GetUserProfileQueryHandler.cs

@@ -8,16 +8,17 @@ namespace NexusReader.Application.Queries.User;
 
 public class GetUserProfileQueryHandler : IRequestHandler<GetUserProfileQuery, Result<UserProfileDto>>
 {
-    private readonly AppDbContext _dbContext;
+    private readonly IDbContextFactory<AppDbContext> _dbContextFactory;
 
-    public GetUserProfileQueryHandler(AppDbContext dbContext)
+    public GetUserProfileQueryHandler(IDbContextFactory<AppDbContext> dbContextFactory)
     {
-        _dbContext = dbContext;
+        _dbContextFactory = dbContextFactory;
     }
 
     public async Task<Result<UserProfileDto>> Handle(GetUserProfileQuery request, CancellationToken cancellationToken)
     {
-        var profile = await _dbContext.Users
+        using var dbContext = await _dbContextFactory.CreateDbContextAsync(cancellationToken);
+        var profile = await dbContext.Users
             .Where(u => u.Id == request.UserId)
             .Select(u => new UserProfileDto
             {