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/index.d.ts

@@ -0,0 +1,12 @@
+import type {ToMarkdownOptions as FootnoteOptions} from 'mdast-util-gfm-footnote'
+import type {Options as TableOptions} from 'mdast-util-gfm-table'
+
+/**
+ * Configuration for `gfmToMarkdown` from `mdast-util-gfm`.
+ *
+ * Currently supports options for `mdast-util-gfm-footnote` and
+ * `mdast-util-gfm-table`.
+ */
+export interface Options extends FootnoteOptions, TableOptions {}
+
+export {gfmFromMarkdown, gfmToMarkdown} from './lib/index.js'