Decouple UserType, add Role entity and management

Removed all UserType logic and references, replacing them with a new Role model and management system. Introduced RoleManager service, repository, and API endpoint for role CRUD operations. Updated user flows and JWT claims to use RoleCode. Removed admin-only user CRUD endpoints. Updated DI, documentation, and error handling for consistency. Appsettings and DTOs now reflect the new role-based approach.

Repos/UserManageRepository.cs

@@ -43,9 +43,8 @@ namespace AuthHex.Repos
         }
 
 
-        public async Task<User?> GetUserByIdentifierAndType(string identifier, Guid? userTypeId)
+        public async Task<User?> GetUserByIdentifierAndType(string identifier)
         {
-
             User? user = await _dbContext.Users
                 .FirstOrDefaultAsync(u =>
                     u.Email == identifier ||
@@ -70,7 +69,6 @@ namespace AuthHex.Repos
         public async Task<User?> GetUserByIdAsync(Guid userId, CancellationToken ct = default)
         {
             return await _dbContext.Users
-                .Include(u => u.UserType)
                 .FirstOrDefaultAsync(u => u.Id == userId, ct);
         }