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/rehype/index.d.ts

@@ -0,0 +1,11 @@
+/// <reference types="rehype-parse" />
+/// <reference types="rehype-stringify" />
+
+import type {Root} from 'hast'
+import type {Processor} from 'unified'
+
+/**
+ * Create a new unified processor that already uses `rehype-parse` and
+ * `rehype-stringify`.
+ */
+export const rehype: Processor<Root, undefined, undefined, Root, string>