feat(content): 11 new SEO/GEO guide articles with per-article OG images

How-to cluster: create-mcp-server-without-code, claude-desktop-mcp-setup,
chatgpt-mcp-connector (incl. honest Business/Enterprise write-connector plan
limits), rest-api-to-mcp-server.
Comparison cluster: mcp-server-hosting-pricing (5-platform matrix),
composio-alternative, smithery-alternative — house style: explicitly state
where competitors win.
Technical/GEO cluster: mcp-transports-explained (SSE deprecation 2025-03-26),
mcp-oauth-plain-english, mcp-server-security-checklist, and German DACH
article mcp-server-ohne-code-erstellen (articleJsonLd gained optional
inLanguage param).

Every article: pageMetadata canonical, Article JSON-LD with Person author +
image + wordCount, BreadcrumbList, FAQPage where applicable, 1200x630 OG
image via shared helper, internal linking. Registry entries in lib/articles.ts
feed guides index, sitemap and RSS automatically. Product claims sourced only
from lib/seo.ts truth — no invented customers, SLAs or certifications.

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

apps/web/lib/seo.ts

@@ -196,6 +196,8 @@ export function articleJsonLd(opts: {
   /** Named human author. Falls back to the Organization. */
   authorName?: string;
   wordCount?: number;
+  /** BCP-47 language tag; the guides corpus is English except where noted. */
+  inLanguage?: string;
 }): object {
   const image = opts.image ?? `${SITE_URL}${opts.path}/opengraph-image`;
   return {
@@ -208,7 +210,7 @@ export function articleJsonLd(opts: {
     image: image.startsWith('http') ? image : `${SITE_URL}${image}`,
     datePublished: opts.datePublished,
     dateModified: opts.dateModified ?? opts.datePublished,
-    inLanguage: 'en',
+    inLanguage: opts.inLanguage ?? 'en',
     author: opts.authorName
       ? { '@type': 'Person', name: opts.authorName }
       : { '@id': `${SITE_URL}/#organization` },