feat: complete FIT Labs landing page

- Astro static site with Tailwind CSS v4
- 6 sections: Hero (gradient mesh), About, Capabilities, Differentiator, CTA, Footer
- Sticky navbar with mobile menu
- Scroll reveal animations
- SEO meta tags and structured data
- Docker + nginx config for Coolify deployment

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

astro.config.mjs

@@ -1,5 +1,11 @@
 // @ts-check
 import { defineConfig } from 'astro/config';
+import tailwindcss from '@tailwindcss/vite';
 
-// https://astro.build/config
-export default defineConfig({});
+export default defineConfig({
+  output: 'static',
+  site: 'https://fitlabs.dev',
+  vite: {
+    plugins: [tailwindcss()],
+  },
+});