refactor: Move Astro to root, use PORT env (default 80), allow all hosts

- Move Astro files from dealplustech-astro/ to project root
- Update Dockerfile: PORT environment variable (default 80)
- Add vite.config.ts with allowedHosts: true
- Matches nixpacks behavior for Easypanel deployment
- No hardcoded ports or domains

node_modules/prismjs/components/prism-nand2tetris-hdl.js

@@ -0,0 +1,9 @@
+Prism.languages['nand2tetris-hdl'] = {
+	'comment': /\/\/.*|\/\*[\s\S]*?(?:\*\/|$)/,
+	'keyword': /\b(?:BUILTIN|CHIP|CLOCKED|IN|OUT|PARTS)\b/,
+	'boolean': /\b(?:false|true)\b/,
+	'function': /\b[A-Za-z][A-Za-z0-9]*(?=\()/,
+	'number': /\b\d+\b/,
+	'operator': /=|\.\./,
+	'punctuation': /[{}[\];(),:]/
+};