release: v0.13.0 (#535)

Twenty-nine commits since v0.12.0. See CHANGELOG.md for the full list
and the upgrade notes.

Ten additions — the SEO package (site URL, robots.txt, sitemap.xml,
JSON-LD), slideshow mode, opt-in original downloads, copy-link,
previous/next album navigation, alt text from the Immich description,
per-album location precision, the update notice, a Help tab, and a
subpage cover grid separate from its photo grid. Two fixes: CJK album
slugs, and the lightbox control bar.

Photo of the Day (#476) was built on `dev` and reverted as not planned;
it never appears in a release.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

https://claude.ai/code/session_01DmsHVRL9yQvckUB1ZpVWre

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: ralksta <ralksta@users.noreply.github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

app/robots.ts

@@ -0,0 +1,41 @@
+import type { MetadataRoute } from 'next';
+import { getConfigOrNull } from '@/lib/config';
+import { isSiteLocked } from '@/lib/auth';
+import { absoluteUrl } from '@/lib/siteUrl';
+
+/**
+ * robots.txt (#472).
+ *
+ * Reflects the same decision `generateMetadata()` already makes for the robots
+ * meta tag, so the two cannot disagree: a site behind a password, or one that
+ * asked not to be indexed, is closed to crawlers here as well.
+ */
+export const dynamic = 'force-dynamic';
+
+export default function robots(): MetadataRoute.Robots {
+  const config = getConfigOrNull();
+
+  // Nothing configured yet — the setup screen is not worth crawling.
+  if (!config) {
+    return { rules: { userAgent: '*', disallow: '/' } };
+  }
+
+  if (isSiteLocked() || config.seo.noIndex) {
+    return { rules: { userAgent: '*', disallow: '/' } };
+  }
+
+  const sitemap = absoluteUrl(config.siteUrl, '/sitemap.xml');
+
+  return {
+    rules: {
+      userAgent: '*',
+      allow: '/',
+      // The image proxy, the admin panel and the installer have nothing to
+      // offer a crawler and plenty to cost the Immich server behind them.
+      disallow: ['/api/', '/admin', '/install'],
+    },
+    // Omitted rather than guessed when no site URL is configured: robots.txt
+    // requires an absolute sitemap URL.
+    ...(sitemap ? { sitemap } : {}),
+  };
+}