feat: Add full PDPA compliance with cookie consent, admin dashboard, and conditional analytics

Features implemented:
✅ Cookie consent banner (Accept/Reject) with localStorage storage
✅ Conditional Umami Analytics (loads only with consent)
✅ Admin dashboard at /admin/consent-logs (password protected)
✅ API endpoints for consent logging (POST/GET/DELETE)
✅ Astro DB integration with consent logging schema
✅ Production-ready Dockerfile with Node.js server adapter
✅ Node.js 20+ requirement for Astro 5.x compatibility

Files added:
- src/components/consent/CookieBanner.astro
- src/pages/api/consent/index.ts (POST/GET endpoints)
- src/pages/api/consent/[sessionId]/index.ts (DELETE endpoint)
- src/pages/admin/consent-logs.astro (admin dashboard)
- db/schema.ts (ConsentLog table schema)

Files modified:
- src/layouts/Layout.astro (CookieBanner + conditional Umami)
- astro.config.mjs (Node adapter + DB integration)
- package.json (start script, engines field, dependencies)
- Dockerfile (custom deployment with Node.js server)

Configuration:
- Umami Analytics: Conditional loading based on consent
- Admin password: 'changeme' (MUST change in production)
- Database: SQLite file (data/consent.db)
- Server: Node.js standalone adapter

Deployment:
- Docker build with SQLite runtime support
- Custom Dockerfile for Easypanel
- Start command: node dist/server/entry.mjs

Security notes:
⚠️  CHANGE ADMIN_PASSWORD before production deployment
⚠️  Enable HTTPS for secure cookie consent
⚠️  Consider server-side authentication for admin dashboard

src/layouts/Layout.astro

@@ -1,5 +1,6 @@
 ---
 import '../styles/global.css'
+import CookieBanner from '../components/consent/CookieBanner.astro'
 
 interface Props {
   title?: string;
@@ -198,6 +199,21 @@ const { title = 'MoreminiMore - ที่ปรึกษาองค์กร AI
       </div>
     </footer>
     
+    <CookieBanner />
+    
+    <!-- Conditional Umami Analytics -->
+    <script is:inline>
+      const consent = JSON.parse(localStorage.getItem('consent-preferences') || 'null');
+      if (consent && consent.analytics === true) {
+        const script = document.createElement('script');
+        script.defer = true;
+        script.src = 'https://umami.moreminimore.com/script.js';
+        script.setAttribute('data-website-id', 'b2e87a6c-0b64-43c8-bb09-e406ffca0af1');
+        script.setAttribute('data-host-url', 'https://umami.moreminimore.com');
+        document.head.appendChild(script);
+      }
+    </script>
+    
     <script>
       // Mobile menu toggle
       const menuBtn = document.getElementById('mobile-menu-btn');