Switch user admin handling from an AppUser boolean to ASP.NET Identity roles. Removed AppUser.IsAdmin and related configuration/model entries; added migration ReplaceIsAdminWithRoles to copy Users.IsAdmin=true into a persistent admin role and drop the IsAdmin column. CurrentUserResponse now exposes roles (string[]), AuthController returns ordered roles from UserManager, and IdentitySeedService now ensures the admin role exists and assigns/creates an initial admin user in that role. Program.cs registers an Admin-only policy (PolicyNames/RoleNames), adjusts cookie auth events to return 401/403 for API requests, and wires up authorization. Frontend updated to use roles: authSession normalizes roles, adds hasRole and ROLE_ADMIN, router and layout support meta.requiredRoles, and new Forbidden and AdminUsers pages/route are added. codexInfo.md updated to reflect the migration to role-based auth.
Introduce ChangePasswordRequest DTO and a new ChangePassword endpoint in AuthController that validates input, changes the user's password via UserManager, updates the security stamp, signs out the user to invalidate sessions, and returns localized messages. Add a simple authorized AppUserController stub (GET /auth/user). Update the 404 view to resolve auth status via fetchCurrentUser, show a dynamic CTA/icon (Dashboard vs Home), auto-redirect after a short delay with proper timer cleanup, and adjust navigation behavior. Update codexInfo.md to document the 404 behavior change.
Introduce authentication API: add AuthController with login, logout and me endpoints using SignInManager/UserManager; add LoginRequest and CurrentUserResponse DTOs. Login enforces active users, updates UpdatedAt on success, and returns localized messages. Also change default seed admin password from "Hoard" to "HoardPassword".
Jonas