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/vite-plugin-astro/metadata.d.ts

@@ -0,0 +1,4 @@
+import type { ModuleInfo } from '../core/module-loader/index.js';
+import type { PluginMetadata } from './types.js';
+export declare function getAstroMetadata(modInfo: ModuleInfo): PluginMetadata['astro'] | undefined;
+export declare function createDefaultAstroMetadata(): PluginMetadata['astro'];