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

web/backend/Features/Features.Users/Commands/Profile/UpdateBiography/UpdateBiographyCommand.cs

@@ -0,0 +1,10 @@
+using MediatR;
+
+namespace Features.Auth.Commands.Profile.UpdateBiography;
+
+/// <summary>Updates the biography of the given user account's profile.</summary>
+/// <param name="UserAccountId">
+///     The authenticated caller's own ID, extracted from the access token -- never bind this from
+///     client-supplied input.
+/// </param>
+public record UpdateBiographyCommand(Guid UserAccountId, string Biography) : IRequest;

web/backend/Features/Features.Users/Commands/Profile/UpdateBiography/UpdateBiographyHandler.cs

@@ -0,0 +1,19 @@
+using Features.Auth.Repository;
+using MediatR;
+
+namespace Features.Auth.Commands.Profile.UpdateBiography;
+
+/// <summary>Handles <see cref="UpdateBiographyCommand" /> by updating the stored biography.</summary>
+public class UpdateBiographyHandler(IUserProfileRepository userProfileRepository)
+    : IRequestHandler<UpdateBiographyCommand>
+{
+    /// <exception cref="Domain.Exceptions.NotFoundException">
+    ///     Thrown when no user profile exists for the given user account.
+    /// </exception>
+    public Task Handle(UpdateBiographyCommand request, CancellationToken cancellationToken) =>
+        userProfileRepository.UpdateBiographyAsync(
+            request.UserAccountId,
+            request.Biography,
+            cancellationToken
+        );
+}