Add NUC Portal - infrastructure dashboard

Next.js 16 dashboard for managing NUC services via Coolify API.
Features service cards with health indicators, deployment dashboard
with live log streaming, S3-backed preview images, SSE real-time
updates, and dark mode support. 18 services across 7 categories.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

nuc-portal/postcss.config.mjs

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