feat: Upgrade to Astro with full PDPA compliance

PDPA Features:
✅ Cookie consent banner
✅ Consent logging API
✅ Admin dashboard
✅ Privacy Policy
✅ Terms & Conditions

Technical:
✅ Astro 5.x + Tailwind v4
✅ Docker on port 80
✅ SQLite database
✅ 15 pages built

Ready for Easypanel deployment.

node_modules/is-inside-container/cli.js

@@ -0,0 +1,5 @@
+#!/usr/bin/env node
+import process from 'node:process';
+import isInsideContainer from './index.js';
+
+process.exitCode = isInsideContainer() ? 0 : 2;