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.

frontend/src/router.tsx

@@ -0,0 +1,10 @@
+import { createRouter } from '@tanstack/react-router'
+import { routeTree } from './routeTree.gen'
+
+export const router = createRouter({ routeTree, defaultPreload: 'intent' })
+
+declare module '@tanstack/react-router' {
+  interface Register {
+    router: typeof router
+  }
+}