fix(seo): canonical self-deindexing on /docs/*, truthful llms.txt, real sitemap dates, RSS feed, breadcrumbs, per-article OG images

- /docs subpages canonicalized to /docs and had no descriptions; each now
  uses pageMetadata with its own path (was: Google could index at most one)
- llms.txt claimed Team EUR 149, RBAC/SLA and BYO-cloud that do not exist;
  regenerated from lib/seo.ts truth + new llms-full.txt with docs content
- sitemap stamped lastModified=now on every request; now real per-route dates
  from new lib/articles.ts registry (single source for guides index/sitemap/RSS)
- new /feed.xml RSS 2.0 route + alternates link in root layout
- articleJsonLd: image (per-guide opengraph-image via lib/og-article.tsx),
  Person author, wordCount; new breadcrumbJsonLd on guides + docs
- GSC verification via NEXT_PUBLIC_GSC_VERIFICATION (documented in .env.example)
- dropped fabricated Enterprise EUR 499 offer from SoftwareApplication JSON-LD
- article-shell: OL/Table/Note primitives for upcoming articles

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SXUwmPVRTD8AKQtio6gCN5

apps/web/lib/seo.ts

@@ -97,6 +97,8 @@ const SOFTWARE_FEATURES = [
   'Self-hostable control plane with BYO Postgres and Redis',
 ];
 
+// Enterprise is deliberately absent: its price is "Custom" and schema.org
+// Offers with fabricated numeric prices are exactly what commit ee4713f purged.
 const OFFERS = [
   {
     name: 'Hobby',
@@ -114,12 +116,6 @@ const OFFERS = [
     price: '199',
     description: '25 servers, 10M tool calls/month, audit log, shared Slack support.',
   },
-  {
-    name: 'Enterprise',
-    price: '499',
-    description:
-      'Unlimited servers; custom infrastructure and data residency on request; dedicated hosting and SSO/SAML scoped per contract; customer success.',
-  },
 ];
 
 /** Organization + WebSite + SoftwareApplication graph — emitted sitewide. */
@@ -191,7 +187,17 @@ export function articleJsonLd(opts: {
   path: string;
   datePublished: string;
   dateModified?: string;
+  /**
+   * Absolute or site-relative image URL. Defaults to the route's generated
+   * opengraph-image (1200×630), which satisfies Google Discover's large-image
+   * requirement once the route ships an opengraph-image.tsx.
+   */
+  image?: string;
+  /** Named human author. Falls back to the Organization. */
+  authorName?: string;
+  wordCount?: number;
 }): object {
+  const image = opts.image ?? `${SITE_URL}${opts.path}/opengraph-image`;
   return {
     '@context': 'https://schema.org',
     '@type': 'TechArticle',
@@ -199,11 +205,29 @@ export function articleJsonLd(opts: {
     description: opts.description,
     url: `${SITE_URL}${opts.path}`,
     mainEntityOfPage: { '@type': 'WebPage', '@id': `${SITE_URL}${opts.path}` },
+    image: image.startsWith('http') ? image : `${SITE_URL}${image}`,
     datePublished: opts.datePublished,
     dateModified: opts.dateModified ?? opts.datePublished,
     inLanguage: 'en',
-    author: { '@id': `${SITE_URL}/#organization` },
+    author: opts.authorName
+      ? { '@type': 'Person', name: opts.authorName }
+      : { '@id': `${SITE_URL}/#organization` },
     publisher: { '@id': `${SITE_URL}/#organization` },
+    ...(opts.wordCount ? { wordCount: opts.wordCount } : {}),
+  };
+}
+
+/** BreadcrumbList structured data. Pass the trail from root to current page. */
+export function breadcrumbJsonLd(trail: { name: string; path: string }[]): object {
+  return {
+    '@context': 'https://schema.org',
+    '@type': 'BreadcrumbList',
+    itemListElement: trail.map((crumb, i) => ({
+      '@type': 'ListItem',
+      position: i + 1,
+      name: crumb.name,
+      item: `${SITE_URL}${crumb.path}`,
+    })),
   };
 }