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>

Dockerfile

@@ -0,0 +1,11 @@
+FROM node:lts AS build
+WORKDIR /app
+COPY package*.json ./
+RUN npm install
+COPY . .
+RUN npm run build
+
+FROM nginx:alpine AS runtime
+COPY ./nginx/nginx.conf /etc/nginx/nginx.conf
+COPY --from=build /app/dist /usr/share/nginx/html
+EXPOSE 8080