feat: Astro Starlight Docs-Site für BTC MAIN AI Application Layer

Vollständige Dokumentations-Site mit:
- Einstieg: Einführung, Schnellstart, Kernkonzepte
- Guides: Deployment, CI/CD, Env-Vars, Domains, Logs
- API-Referenz: Überblick, Auth, Applications, Deployments
- Referenz: Tech Stack, FAQ
- Dockerfile + nginx für containerisiertes Deployment

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

Dockerfile

@@ -0,0 +1,12 @@
+FROM node:20-alpine AS builder
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci
+COPY . .
+RUN npm run build
+
+FROM nginx:alpine
+COPY --from=builder /app/dist /usr/share/nginx/html
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]