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/token/route.ts

@@ -0,0 +1,53 @@
+import { NextResponse } from 'next/server'
+import jwt from 'jsonwebtoken'
+
+export const runtime = 'nodejs'
+
+export async function POST(request: Request) {
+  try {
+    const { token } = await request.json()
+
+    if (!token) {
+      return NextResponse.json({ error: 'Token required' }, { status: 400 })
+    }
+
+    // Log environment info
+    const hasSecret = !!process.env.JWT_SECRET
+    const secretPreview = process.env.JWT_SECRET ? process.env.JWT_SECRET.substring(0, 10) + '...' : 'MISSING'
+
+    console.log('Debug: JWT_SECRET exists:', hasSecret)
+    console.log('Debug: JWT_SECRET preview:', secretPreview)
+
+    // Try to decode without verification first
+    let decodedWithoutVerification
+    try {
+      decodedWithoutVerification = jwt.decode(token, { complete: true })
+      console.log('Debug: Token decoded without verification:', !!decodedWithoutVerification)
+    } catch (e) {
+      console.log('Debug: Token decode failed:', e.message)
+    }
+
+    // Try to verify
+    let verificationResult
+    try {
+      verificationResult = jwt.verify(token, process.env.JWT_SECRET!)
+      console.log('Debug: Token verification successful')
+    } catch (e) {
+      console.log('Debug: Token verification failed:', e.message)
+      verificationResult = { error: e.message }
+    }
+
+    return NextResponse.json({
+      hasSecret,
+      secretPreview,
+      decodedWithoutVerification: !!decodedWithoutVerification,
+      payload: decodedWithoutVerification?.payload,
+      verificationResult: typeof verificationResult === 'object' && 'error' in verificationResult
+        ? verificationResult
+        : { success: true, payload: verificationResult }
+    })
+  } catch (error) {
+    console.error('Debug endpoint error:', error)
+    return NextResponse.json({ error: 'Debug failed' }, { status: 500 })
+  }
+}