feat: base Astro template for RU market

- Astro config with RSS, sitemap
- Pagefind search integration
- Schema.org structured data
- JSON Feed
- 10 starter pages (home, about, blog)
- 6 blog post templates
- llms.txt for LLM consumption
- bun package manager
- .gitignore (node_modules, dist, .astro)

public/robots.txt

@@ -0,0 +1,7 @@
+User-agent: *
+Allow: /
+Disallow: /cdn-cgi/
+
+Sitemap: https://izhs-dom.ru/sitemap-index.xml
+
+Host: izhs-dom.ru