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/favicon.svg

@@ -0,0 +1,4 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 32 32">
+  <rect width="32" height="32" fill="#2d6a4f" rx="4"/>
+  <text x="16" y="23" text-anchor="middle" font-size="20" fill="white">🏠</text>
+</svg>