feat(seo): add imprint and German URLs to sitemap

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/sitemap.xml

@@ -2,8 +2,26 @@
 <urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
   <url>
     <loc>https://fraujulian.xyz</loc>
-    <lastmod>2026-04-17</lastmod>
+    <lastmod>2026-10-15</lastmod>
     <changefreq>monthly</changefreq>
     <priority>1.0</priority>
   </url>
+  <url>
+    <loc>https://fraujulian.xyz/?lang=de</loc>
+    <lastmod>2026-10-15</lastmod>
+    <changefreq>monthly</changefreq>
+    <priority>1.0</priority>
+  </url>
+  <url>
+    <loc>https://fraujulian.xyz/imprint</loc>
+    <lastmod>2026-10-15</lastmod>
+    <changefreq>yearly</changefreq>
+    <priority>0.3</priority>
+  </url>
+  <url>
+    <loc>https://fraujulian.xyz/imprint?lang=de</loc>
+    <lastmod>2026-10-15</lastmod>
+    <changefreq>yearly</changefreq>
+    <priority>0.3</priority>
+  </url>
 </urlset>