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/DeleteMyAccount/DeleteMyAccountCommandHandler.cs

@@ -0,0 +1,22 @@
+using LiteCqrs;
+using TeleWave.Application.Common.Interfaces;
+using TeleWave.Application.Common.Models;
+
+namespace TeleWave.Application.Auth.DeleteMyAccount;
+
+public sealed class DeleteMyAccountCommandHandler(
+    IIdentityService identityService,
+    ICurrentUser currentUser
+) : ICommandHandler<DeleteMyAccountCommand, Result>
+{
+    public async Task<Result> Handle(
+        DeleteMyAccountCommand command,
+        CancellationToken cancellationToken
+    )
+    {
+        if (currentUser.UserId is not { } userId)
+            return Result.Failure(AuthErrors.Unauthorized);
+
+        return await identityService.DeleteUserAsync(userId, cancellationToken);
+    }
+}