migrate: rewrite site as Astro static site

- Convert from single HTML to Astro project
- All content preserved and enhanced (features, ecosystem, variants, quick start, architecture, repos)
- Bilingual CN/EN via data-lang toggle
- Tabbed quick start (Full / Standalone / Dashboard / Agent)
- GitHub Actions deploy workflow to GitHub Pages
- Static build, zero client JS except lang/tab toggle

Author: dajiaohuang

.github/workflows/deploy.yml

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+name: Deploy to GitHub Pages
+on:
+  push:
+    branches: [main]
+  workflow_dispatch:
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+concurrency:
+  group: pages
+  cancel-in-progress: false
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 22
+          cache: npm
+      - run: npm ci
+      - run: npm run build
+      - uses: actions/upload-pages-artifact@v3
+        with:
+          path: dist/
+  deploy:
+    needs: build
+    runs-on: ubuntu-latest
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+    steps:
+      - id: deployment
+        uses: actions/deploy-pages@v4

.gitignore

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+# build output
+dist/
+
+# generated types
+.astro/
+
+# dependencies
+node_modules/
+
+# logs
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+
+# environment variables
+.env
+.env.production
+
+# macOS-specific files
+.DS_Store
+
+# jetbrains setting folder
+.idea/

.vscode/extensions.json

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+{
+  "recommendations": ["astro-build.astro-vscode"],
+  "unwantedRecommendations": []
+}

.vscode/launch.json

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+{
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "command": "./node_modules/.bin/astro dev",
+      "name": "Development server",
+      "request": "launch",
+      "type": "node-terminal"
+    }
+  ]
+}

AGENTS.md

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+## Development
+
+When starting the dev server, use background mode:
+
+```
+astro dev --background
+```
+
+Manage the background server with `astro dev stop`, `astro dev status`, and `astro dev logs`.
+
+## Documentation
+
+Full documentation: https://docs.astro.build
+
+Consult these guides before working on related tasks:
+
+- [Adding pages, dynamic routes, or middleware](https://docs.astro.build/en/guides/routing/)
+- [Working with Astro components](https://docs.astro.build/en/basics/astro-components/)
+- [Using React, Vue, Svelte, or other framework components](https://docs.astro.build/en/guides/framework-components/)
+- [Adding or managing content](https://docs.astro.build/en/guides/content-collections/)
+- [Adding styles or using Tailwind](https://docs.astro.build/en/guides/styling/)
+- [Supporting multiple languages](https://docs.astro.build/en/guides/internationalization/)

CLAUDE.md

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+## Development
+
+When starting the dev server, use background mode:
+
+```
+astro dev --background
+```
+
+Manage the background server with `astro dev stop`, `astro dev status`, and `astro dev logs`.
+
+## Documentation
+
+Full documentation: https://docs.astro.build
+
+Consult these guides before working on related tasks:
+
+- [Adding pages, dynamic routes, or middleware](https://docs.astro.build/en/guides/routing/)
+- [Working with Astro components](https://docs.astro.build/en/basics/astro-components/)
+- [Using React, Vue, Svelte, or other framework components](https://docs.astro.build/en/guides/framework-components/)
+- [Adding or managing content](https://docs.astro.build/en/guides/content-collections/)
+- [Adding styles or using Tailwind](https://docs.astro.build/en/guides/styling/)
+- [Supporting multiple languages](https://docs.astro.build/en/guides/internationalization/)

README.md

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+# Astro Starter Kit: Basics
+
+```sh
+npm create astro@latest -- --template basics
+```
+
+> 🧑‍🚀 **Seasoned astronaut?** Delete this file. Have fun!
+
+## 🚀 Project Structure
+
+Inside of your Astro project, you'll see the following folders and files:
+
+```text
+/
+├── public/
+│   └── favicon.svg
+├── src
+│   ├── assets
+│   │   └── astro.svg
+│   ├── components
+│   │   └── Welcome.astro
+│   ├── layouts
+│   │   └── Layout.astro
+│   └── pages
+│       └── index.astro
+└── package.json
+```
+
+To learn more about the folder structure of an Astro project, refer to [our guide on project structure](https://docs.astro.build/en/basics/project-structure/).
+
+## 🧞 Commands
+
+All commands are run from the root of the project, from a terminal:
+
+| Command                   | Action                                           |
+| :------------------------ | :----------------------------------------------- |
+| `npm install`             | Installs dependencies                            |
+| `npm run dev`             | Starts local dev server at `localhost:4321`      |
+| `npm run build`           | Build your production site to `./dist/`          |
+| `npm run preview`         | Preview your build locally, before deploying     |
+| `npm run astro ...`       | Run CLI commands like `astro add`, `astro check` |
+| `npm run astro -- --help` | Get help using the Astro CLI                     |
+
+## 👀 Want to learn more?
+
+Feel free to check [our documentation](https://docs.astro.build) or jump into our [Discord server](https://astro.build/chat).

astro.config.mjs

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+// @ts-check
+import { defineConfig } from 'astro/config';
+
+// https://astro.build/config
+export default defineConfig({
+  site: 'https://SagaSmithAI.github.io',
+});