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/actions/runtime/client.js

@@ -0,0 +1,11 @@
+export * from "./shared.js";
+function defineAction() {
+  throw new Error("[astro:action] `defineAction()` unexpectedly used on the client.");
+}
+function getActionContext() {
+  throw new Error("[astro:action] `getActionContext()` unexpectedly used on the client.");
+}
+export {
+  defineAction,
+  getActionContext
+};