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.

Interfaces/IUserManageRepository.cs

@@ -7,7 +7,7 @@ namespace AuthHex.Interfaces
         Task<User> AddUserAsync(User user, CancellationToken ct = default);
         Task<Token> AddTokenAsync(Token token, CancellationToken ct = default);
         Task<List<User>> GetUserByIdentifiers(string? email, string? mobileNumber, string? nic, string? username, string? Optional1);
-        Task<User?> GetUserByIdentifierAndType(string identifier, Guid? userTypeId);
+        Task<User?> GetUserByIdentifierAndType(string identifier);
         Task<User?> GetUserByIdAsync(Guid userId, CancellationToken ct = default);
         Task UpdateUserAsync(User user, CancellationToken ct = default);
         Task<List<UserSession>> GetUserSessionsAsync(Guid userId, CancellationToken ct = default);