i18n(upgrade): publish DE + ES ODOO Community Upgrade pages (/de/, /es/), sitemap + llms.txt

Copy-only mirrors of odoo-community-upgrade.html built by translator against the
post-R1-R5 English (EN af27098a, commit 2fe0c31), rendered through work/i18n/build-i18n.py:
<html lang>, canonical, 4-way hreflang cluster (en-US/de/es/x-default), og:url,
/static/lang.js and 15 rebased refs. No EN page change.

- sitemap.xml: 33 -> 35 <loc>, both new pages at priority 0.9
- llms.txt ## Languages: DE + ES lists now name /<lang>/odoo-community-upgrade.html
- checks: check-links.py 0 broken, verify-html.py 0 problems (tag balance, JSON-LD,
  sitemap XML), JSON-LD FAQPage answers verbatim in the visible FAQ 8/8 per page

sitemap.xml

@@ -198,4 +198,16 @@
     <changefreq>monthly</changefreq>
     <priority>0.9</priority>
   </url>
+  <url>
+    <loc>https://odoo4projects.com/de/odoo-community-upgrade.html</loc>
+    <lastmod>2026-10-27</lastmod>
+    <changefreq>monthly</changefreq>
+    <priority>0.9</priority>
+  </url>
+  <url>
+    <loc>https://odoo4projects.com/es/odoo-community-upgrade.html</loc>
+    <lastmod>2026-10-27</lastmod>
+    <changefreq>monthly</changefreq>
+    <priority>0.9</priority>
+  </url>
 </urlset>