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/core/polyfill.js

@@ -0,0 +1,17 @@
+import buffer from "node:buffer";
+import crypto from "node:crypto";
+function apply() {
+  if (!globalThis.crypto) {
+    Object.defineProperty(globalThis, "crypto", {
+      value: crypto.webcrypto
+    });
+  }
+  if (!globalThis.File) {
+    Object.defineProperty(globalThis, "File", {
+      value: buffer.File
+    });
+  }
+}
+export {
+  apply
+};