Fix robots.txt and sitemap issues from code review

- Point Sitemap directive at /sitemap.xml (not .gz) so crawlers receive
  plain XML without needing Content-Encoding headers
- Add Disallow: /leagues/ to block all auth-gated league routes
- Gitignore public/sitemap.xml* so they are always generated fresh at
  build time rather than serving a stale committed snapshot

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -24,3 +24,7 @@ storybook-static
 
 # Clerk migration export — contains password hashes, never commit
 exported_users.csv
+
+# Generated at build time by scripts/generate-sitemap.mjs
+/public/sitemap.xml
+/public/sitemap.xml.gz

public/robots.txt

@@ -3,8 +3,9 @@ Allow: /
 
 Disallow: /admin/
 Disallow: /api/
+Disallow: /leagues/
 Disallow: /onboarding
 Disallow: /settings
 Disallow: /user-profile
 
-Sitemap: https://brackt.com/sitemap.xml.gz
+Sitemap: https://brackt.com/sitemap.xml

public/sitemap.xml

@@ -1,39 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
-  <url>
-    <loc>https://brackt.com/</loc>
-    <lastmod>2026-05-25</lastmod>
-    <changefreq>weekly</changefreq>
-    <priority>1.0</priority>
-  </url>
-  <url>
-    <loc>https://brackt.com/how-to-play</loc>
-    <lastmod>2026-05-25</lastmod>
-    <changefreq>monthly</changefreq>
-    <priority>0.8</priority>
-  </url>
-  <url>
-    <loc>https://brackt.com/rules</loc>
-    <lastmod>2026-05-25</lastmod>
-    <changefreq>monthly</changefreq>
-    <priority>0.8</priority>
-  </url>
-  <url>
-    <loc>https://brackt.com/sports</loc>
-    <lastmod>2026-05-25</lastmod>
-    <changefreq>weekly</changefreq>
-    <priority>0.8</priority>
-  </url>
-  <url>
-    <loc>https://brackt.com/support</loc>
-    <lastmod>2026-05-25</lastmod>
-    <changefreq>monthly</changefreq>
-    <priority>0.6</priority>
-  </url>
-  <url>
-    <loc>https://brackt.com/privacy-policy</loc>
-    <lastmod>2026-05-25</lastmod>
-    <changefreq>yearly</changefreq>
-    <priority>0.4</priority>
-  </url>
-</urlset>