[FA-misc] Switches to using DTOs, updates frontend with details and reader page, updates novel import to be an upsert

FictionArchive.Service.UserService/Models/DTOs/UserDto.cs

@@ -0,0 +1,15 @@
+using NodaTime;
+
+namespace FictionArchive.Service.UserService.Models.DTOs;
+
+public class UserDto
+{
+    public Guid Id { get; init; }
+    public Instant CreatedTime { get; init; }
+    public Instant LastUpdatedTime { get; init; }
+    public required string Username { get; init; }
+    public required string Email { get; init; }
+    // OAuthProviderId intentionally omitted for security
+    public bool Disabled { get; init; }
+    public UserDto? Inviter { get; init; }
+}