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>

app/api/debug/user/route.ts

@@ -0,0 +1,43 @@
+import { NextResponse } from 'next/server'
+import { prisma } from '@/lib/db'
+
+export const runtime = 'nodejs'
+
+export async function POST(request: Request) {
+  try {
+    const { userId } = await request.json()
+
+    if (!userId) {
+      return NextResponse.json({ error: 'userId required' }, { status: 400 })
+    }
+
+    // Use raw query to avoid Prisma client sync issues
+    const users = await prisma.$queryRaw`
+      SELECT id, email, name, role, theme, "fontSize", "createdAt", "updatedAt", "lastLoginAt"
+      FROM "User"
+      WHERE id = ${userId}
+    `
+    const user = Array.isArray(users) && users.length > 0 ? users[0] : null
+
+    // Also get a count of all users
+    const userCount = await prisma.user.count()
+
+    // Get all user IDs for comparison
+    const allUsers = await prisma.user.findMany({
+      select: { id: true, email: true, createdAt: true },
+      orderBy: { createdAt: 'desc' },
+      take: 5
+    })
+
+    return NextResponse.json({
+      searchedUserId: userId,
+      userExists: !!user,
+      user: user || null,
+      totalUsers: userCount,
+      recentUsers: allUsers
+    })
+  } catch (error) {
+    console.error('User debug error:', error)
+    return NextResponse.json({ error: 'Debug failed', details: error.message }, { status: 500 })
+  }
+}