Add Jack 3D Creator portfolio template (Phase 1) with PRD

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Msa87P1aZQSV9MWhEu3VfJ

jack-portfolio/tailwind.config.js

@@ -0,0 +1,6 @@
+/** @type {import('tailwindcss').Config} */
+export default {
+  content: ['./index.html', './src/**/*.{ts,tsx}'],
+  theme: { extend: { fontFamily: { sans: ['Kanit', 'sans-serif'] } } },
+  plugins: [],
+};