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

db/schema.ts

@@ -0,0 +1,20 @@
+import { defineDb, defineTable, column } from 'astro:db';
+
+// ConsentLog table for PDPA compliance
+const ConsentLog = defineTable({
+  columns: {
+    id: column.number({ primaryKey: true }),
+    sessionId: column.text({ unique: true }),
+    timestamp: column.date(),
+    essential: column.boolean(),
+    analytics: column.boolean(),
+    marketing: column.boolean(),
+    policyVersion: column.text(),
+    ipHash: column.text(),
+    userAgent: column.text()
+  }
+});
+
+export default defineDb({
+  tables: { ConsentLog }
+});