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/astro/dist/runtime/client/visible.prebuilt.d.ts

@@ -0,0 +1,7 @@
+/**
+ * This file is prebuilt from packages/astro/src/runtime/client/visible.ts
+ * Do not edit this directly, but instead edit that file and rerun the prebuild
+ * to generate this file.
+ */
+declare const _default: "(()=>{var a=(s,i,o)=>{let r=async()=>{await(await s())()},t=typeof i.value==\"object\"?i.value:void 0,c={rootMargin:t==null?void 0:t.rootMargin},n=new IntersectionObserver(e=>{for(let l of e)if(l.isIntersecting){n.disconnect(),r();break}},c);for(let e of o.children)n.observe(e)};(self.Astro||(self.Astro={})).visible=a;window.dispatchEvent(new Event(\"astro:visible\"));})();";
+export default _default;