Initial commit: base slice (auth, roles, users, admin) scaffold

Backend: .NET 10 Clean Architecture + LiteCqrs.Net + EF Core/PostgreSQL +
Identity/JWT. Frontend: React 19 + Vite + TanStack Query/Router + Tailwind v4
with a retro CRT theme. Docker/compose deployment mirroring PnvPanel's
conventions, scoped down to the current base feature set.

backend/src/TeleWave.Application/Auth/Login/LoginCommandValidator.cs

@@ -0,0 +1,12 @@
+using FluentValidation;
+
+namespace TeleWave.Application.Auth.Login;
+
+public sealed class LoginCommandValidator : AbstractValidator<LoginCommand>
+{
+    public LoginCommandValidator()
+    {
+        RuleFor(x => x.UserName).NotEmpty();
+        RuleFor(x => x.Password).NotEmpty();
+    }
+}