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/mdast-util-gfm-strikethrough/index.d.ts

@@ -0,0 +1,19 @@
+export {
+  gfmStrikethroughFromMarkdown,
+  gfmStrikethroughToMarkdown
+} from './lib/index.js'
+
+// Add custom data tracked to turn a syntax tree into markdown.
+declare module 'mdast-util-to-markdown' {
+  interface ConstructNameMap {
+    /**
+     * Whole strikethrough.
+     *
+     * ```markdown
+     * > | ~~a~~
+     *     ^^^^^
+     * ```
+     */
+    strikethrough: 'strikethrough'
+  }
+}