feat: add initial implementation of Kitchen CRM with authentication and dashboard features

- Create global styles and theme management
- Implement app shell layout with sidebar navigation
- Add authentication layout and pages for login and registration
- Develop dashboard page with placeholder content
- Introduce routing guards for guest-only and authenticated routes
- Set up Zustand for state management of authentication and theme
- Create API types and structures for CRM entities
- Configure Vite with PWA support and Tailwind CSS

frontend/src/layouts/auth-layout.tsx

@@ -0,0 +1,22 @@
+import { Outlet } from 'react-router-dom'
+
+import { AppLogo } from '@/components/navigation/app-logo'
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from '@/components/ui/card'
+
+export const AuthLayout = () => (
+  <div className="flex min-h-screen flex-col items-center justify-center bg-gradient-to-br from-slate-950 via-slate-900 to-slate-950 p-6 text-white">
+    <div className="mb-8 text-center">
+      <AppLogo className="text-white" />
+      <p className="text-sm text-slate-300">Войдите, чтобы управлять воронкой продаж</p>
+    </div>
+    <Card className="w-full max-w-md border-white/10 bg-white/5 text-white">
+      <CardHeader>
+        <CardTitle>Kitchen CRM</CardTitle>
+        <CardDescription className="text-slate-200">Мини-CRM с мультитенантной архитектурой</CardDescription>
+      </CardHeader>
+      <CardContent>
+        <Outlet />
+      </CardContent>
+    </Card>
+  </div>
+)