feat: Add official website and configure /app base path for product frontend
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Build DeepDiagram official website with Next.js 15, next-intl (zh/en),
MDX blog system, and full SEO (sitemap, robots, JSON-LD, OG images) -
Add pages: Home, Features, Pricing, Blog, Docs, About, Changelog
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Write documentation (Getting Started, Deployment Guide, API Reference)
in both Chinese and English based on actual project source code -
Add feature demo images and product demo GIF to website
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Configure frontend SPA to serve under /app base path (Vite base + nginx alias)
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Add website Docker image build to CI/CD pipeline (GitHub Actions)
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Add website service to docker-compose.yml
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Update all product links from deepd.cturing.cn to deepd.cturing.cn/app
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Update SITE_URL to https://deepd.cturing.cn across sitemap, robots,
metadata, and JSON-LD structured data