Fix authentication state persistence and admin role display

- Implement complete authentication system with JWT token validation
- Add auth provider with persistent login state across page refreshes
- Create multilingual login/register forms with Material-UI components
- Fix token validation using raw SQL queries to bypass Prisma sync issues
- Add comprehensive error handling for expired/invalid tokens
- Create profile and settings pages with full i18n support
- Add proper user role management (admin/user) with database sync
- Implement secure middleware with CSRF protection and auth checks
- Add debug endpoints for troubleshooting authentication issues
- Fix Zustand store persistence for authentication state

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

components/auth/protected-route.tsx

@@ -0,0 +1,48 @@
+'use client'
+
+import { ReactNode, useEffect } from 'react'
+import { useRouter } from 'next/navigation'
+import { useLocale } from 'next-intl'
+import { useAuth } from './auth-provider'
+import { Box, CircularProgress, Typography } from '@mui/material'
+
+interface ProtectedRouteProps {
+  children: ReactNode
+  fallback?: ReactNode
+}
+
+export function ProtectedRoute({ children, fallback }: ProtectedRouteProps) {
+  const { isAuthenticated, isLoading } = useAuth()
+  const router = useRouter()
+  const locale = useLocale()
+
+  useEffect(() => {
+    if (!isLoading && !isAuthenticated) {
+      router.push(`/${locale}/login`)
+    }
+  }, [isAuthenticated, isLoading, router, locale])
+
+  if (isLoading) {
+    return fallback || (
+      <Box
+        display="flex"
+        flexDirection="column"
+        alignItems="center"
+        justifyContent="center"
+        minHeight="60vh"
+        gap={2}
+      >
+        <CircularProgress />
+        <Typography variant="body2" color="text.secondary">
+          Loading...
+        </Typography>
+      </Box>
+    )
+  }
+
+  if (!isAuthenticated) {
+    return null
+  }
+
+  return <>{children}</>
+}