Add user avatar and profile feature, consolidate Auth and UserManagement features (#257)

web/backend/Features/Features.Users/Queries/GetAllUsers/GetAllUsersHandler.cs

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+using Domain.Entities;
+using Features.Auth.Repository;
+using MediatR;
+
+namespace Features.Auth.Queries.GetAllUsers;
+
+public class GetAllUsersHandler(IUserListRepository repository)
+    : IRequestHandler<GetAllUsersQuery, IEnumerable<UserAccount>>
+{
+    public Task<IEnumerable<UserAccount>> Handle(
+        GetAllUsersQuery request,
+        CancellationToken cancellationToken
+    )
+    {
+        return repository.GetAllAsync(request.Limit, request.Offset);
+    }
+}

web/backend/Features/Features.Users/Queries/GetAllUsers/GetAllUsersQuery.cs

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+using Domain.Entities;
+using MediatR;
+
+namespace Features.Auth.Queries.GetAllUsers;
+
+/// <summary>
+///     Requests a page of user accounts, ordered by creation date descending.
+/// </summary>
+/// <param name="Limit"><c>null</c> for no limit.</param>
+/// <param name="Offset"><c>null</c> for no offset.</param>
+public record GetAllUsersQuery(int? Limit, int? Offset) : IRequest<IEnumerable<UserAccount>>;

web/backend/Features/Features.Users/Queries/GetUserById/GetUserByIdHandler.cs

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+using Domain.Entities;
+using Domain.Exceptions;
+using Features.Auth.Repository;
+using MediatR;
+
+namespace Features.Auth.Queries.GetUserById;
+
+public class GetUserByIdHandler(IUserListRepository repository)
+    : IRequestHandler<GetUserByIdQuery, UserAccount>
+{
+    /// <exception cref="NotFoundException">Thrown when no user account exists with the given ID.</exception>
+    public async Task<UserAccount> Handle(
+        GetUserByIdQuery request,
+        CancellationToken cancellationToken
+    )
+    {
+        UserAccount? user = await repository.GetByIdAsync(request.UserAccountId);
+        if (user is null)
+            throw new NotFoundException($"User with ID {request.UserAccountId} not found");
+        return user;
+    }
+}

web/backend/Features/Features.Users/Queries/GetUserById/GetUserByIdQuery.cs

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+using Domain.Entities;
+using MediatR;
+
+namespace Features.Auth.Queries.GetUserById;
+
+public record GetUserByIdQuery(Guid UserAccountId) : IRequest<UserAccount>;