feat(frontend): scaffold Next.js app tooling and static assets

Set up the App Router toolchain, Docker build, Apple emoji vendor script, and public branding assets.

frontend/postcss.config.mjs

@@ -0,0 +1,7 @@
+const config = {
+  plugins: {
+    "@tailwindcss/postcss": {},
+  },
+};
+
+export default config;