Performance & SEO optimization + Google login for CMS

Performance:
- Enable image optimization (Image: true, SVG: true)
- 429MB saved with WebP conversion

SEO:
- Add JSON-LD structured data (Organization & FAQ schemas)
- Add keywords and author metadata
- Update robots.txt with sitemap reference
- Add alt text to OpenGraph images

CMS:
- Enable Google OAuth login for admin panel
- Add logo to admin login page

Fixes:
- Update Telegram link to @ym1ktc on homepage

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

astro.config.ts

@@ -60,9 +60,9 @@ export default defineConfig({
           removeAttributeQuotes: false,
         },
       },
-      Image: false,
+      Image: true,
       JavaScript: true,
-      SVG: false,
+      SVG: true,
       Logger: 1,
     }),