feat(seo): add Market Score to sitemap and footer

Subtask 4/6: Add /market-score to STATIC_PATHS for sitemap
generation (both lang variants + hreflang). Add footer link
in Product column between Markets and For Suppliers.

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

web/src/padelnomics/sitemap.py

@@ -23,6 +23,7 @@ STATIC_PATHS = [
     "/imprint",
     "/suppliers",
     "/markets",
+    "/market-score",
     "/planner/",
     "/directory/",
 ]

web/src/padelnomics/templates/base.html

@@ -171,6 +171,7 @@
           <li><a href="{{ url_for('planner.index') }}">{{ t.nav_planner }}</a></li>
           <li><a href="{{ url_for('directory.index') }}">{{ t.nav_directory }}</a></li>
           <li><a href="{{ url_for('content.markets') }}">{{ t.nav_markets }}</a></li>
+          <li><a href="{{ url_for('public.market_score') }}">{{ t.footer_market_score }}</a></li>
           <li><a href="{{ url_for('public.suppliers') }}">{{ t.nav_suppliers }}</a></li>
         </ul>
       </div>