Nuxt: fix sitemap missing handbook, ebooks, whitepapers, and integrations pages

[Yndira-E]

Description

sitemap.xml was only listing 1 URL (/resources/publications) in production, everything native to Nuxt (handbook, ebooks, whitepapers, integrations) was missing.

• Wire handbook, ebooks, and whitepapers content collections into @nuxtjs/sitemap's native @nuxt/content v3 integration (defineSitemapSchema() in content.config.ts), instead of relying on static-route auto-discovery, which can't see dynamic routes.
• Add a dedicated source for integrations (not a content collection — built from the npm/GitHub catalogue at request time).
• Drop the runtime bridge that read sitemap-legacy.xml and merged it into sitemap.xml on every request. Instead, declare both sitemaps separately in robots.txt: sitemap.xml for Nuxt-native pages, sitemap-legacy.xml (served as-is from nuxt/public/) for whatever's still on 11ty.
• Remove a manual useHead robots meta tag in pages/[...slug].vue that raced against @nuxtjs/robots's own computed meta/header for the same pages — now routeRules is the single source of truth.
• Move /terms from a hardcoded .vue page to nuxt/content/terms.md, matching the existing privacy-policy.md pattern (both now render through the same pages/[...slug].vue catch-all).

Verified locally

• sitemap.xml: 241 URLs (174 handbook + 60 integrations + 4 whitepapers + 2 ebooks + 1 publications), no noindex leaks.
• sitemap-legacy.xml: confirmed reachable and correctly proxied to 11ty in dev; will be served as a static file from nuxt/public/ in production (11ty build step runs before the Nuxt build).
• /terms and /privacy-policy: both return noindex, nofollow even when simulating production (?mockProductionEnv=1).

Related Issue(s)

Checklist

• I have read the contribution guidelines
• I have considered the performance impact of these changes
• Suitable unit/system level tests have been added and they pass
• Documentation has been updated
• For blog PRs, an Art Request has been created (instructions)

[netlify]

✅ Deploy Preview for flowforge-website ready!

Name	Link
🔨 Latest commit	af28827
🔍 Latest deploy log	https://app.netlify.com/projects/flowforge-website/deploys/6a608b23ddbbbf0008ecbc31
😎 Deploy Preview	https://deploy-preview-5351--flowforge-website.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
Lighthouse	1 paths audited Performance: 63 (🔴 down 11 from production) Accessibility: 96 (no change from production) Best Practices: 100 (no change from production) SEO: 91 (no change from production) PWA: - View the detailed breakdown and full score reports

---

To edit notification comments on pull requests, go to your Netlify project configuration.