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.Infrastructure/Identity/CurrentUser.cs

@@ -0,0 +1,22 @@
+using System.Security.Claims;
+using Microsoft.AspNetCore.Http;
+using TeleWave.Application.Common.Interfaces;
+
+namespace TeleWave.Infrastructure.Identity;
+
+internal sealed class CurrentUser(IHttpContextAccessor httpContextAccessor) : ICurrentUser
+{
+    private ClaimsPrincipal? Principal => httpContextAccessor.HttpContext?.User;
+
+    public Guid? UserId => ParseHttpUserId();
+
+    public string? UserName => Principal?.FindFirstValue(ClaimTypes.Name);
+
+    public bool IsAuthenticated => Principal?.Identity?.IsAuthenticated ?? false;
+
+    private Guid? ParseHttpUserId()
+    {
+        var value = Principal?.FindFirstValue(ClaimTypes.NameIdentifier);
+        return Guid.TryParse(value, out var id) ? id : null;
+    }
+}