Add user profile and avatar upload feature

web/backend/Features/Features.Users/Repository/IUserProfileRepository.cs

@@ -0,0 +1,13 @@
+namespace Features.Auth.Repository;
+
+/// <summary>
+///     Repository for resolving user profile records.
+/// </summary>
+public interface IUserProfileRepository
+{
+    /// <summary>
+    ///     Returns the <c>UserProfileID</c> for <paramref name="userAccountId" />, creating an empty
+    ///     profile first if one doesn't already exist.
+    /// </summary>
+    Task<Guid> GetOrCreateProfileIdAsync(Guid userAccountId, CancellationToken cancellationToken);
+}