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/csso/lib/replace/Url.js

@@ -0,0 +1,4 @@
+export default function(node) {
+    // convert `\\` to `/`
+    node.value = node.value.replace(/\\/g, '/');
+};