fix(sitemap): add lastmod and hreflang alternates where missing

[TheMeinerLP]

Summary

Adds lastmod where the content has a real date, and fixes event translation alternates. Counts come from the local pnpm dev sitemap, before and after this change.

Sitemap	URLs	lastmod before	lastmod after	xhtml:link alternates before / after
de-DE.xml	32	16 / 32	20 / 32	32 / 32
en-US.xml	31	15 / 31	19 / 31	31 / 31

Newly dated: the blog, projects and community POI index pages, and the blog author page (en: /en/blog/author/themeinerlp, de: /de/blog/author/themeinerlp).

What changed

• Index pages (server/api/__sitemap__/index-pages.ts, shared/utils/indexPageSitemap.ts): the index's lastmod is the newest date among the items it lists, dated the way each item's own sitemap entry is dated. Blog uses released articles only; projects use updatedAt; community POI uses updatedAt ?? startedAt. Pages with no derivable date get no entry, so the app's own entry stands. The source adds lastmod to an existing app entry; the sitemap merges on loc and keeps the alternates.
• Author pages (shared/utils/blogAuthors.ts): lastmod is the newest modified date of the author's released articles in that locale. updatedDate is now selected.
• Events (shared/utils/eventRoutes.ts): translations are paired by translationKey, as the detail page pairs them, so events whose slugs differ get alternates. Only listed translations are included.
• Shared date helpers live in shared/utils/sitemapDates.ts.

Choices and what was not changed

• No lastmod from build or request time. Team pages, the team index, the events index, and the home, about, bluemap and community pages have no content date, so they keep no lastmod. The team data has no updated date, and no content file carries one for events.
• Team and author alternates are unchanged. On the live sitemap and locally, every team member URL and the author page already carry three xhtml:link entries. The module pairs them by identical slug across locales, so this change does not touch them.

Tests

• New and updated unit tests (F.I.R.S.T., pure functions, no network or D1): tests/shared/indexPageSitemap.spec.ts, tests/shared/blogAuthors.spec.ts, tests/shared/eventRoutes.spec.ts.
• tests/architecture/module-boundaries.spec.ts: index-pages.ts is registered as a named exception, for the same Nitro locales import as team.ts, events.ts and blog-authors.ts.
• pnpm test: 165 files, 1304 tests passing.
• pnpm quality: ESLint errors 186 (baseline 186), TypeScript errors 3 (baseline 3). No regression.
• pnpm typecheck reports the same 3 errors as the baseline, in layers/community-poi/composables/useCommunityPoi.ts and layers/home/composables/useHomeContent.ts. Neither file is touched here.
• pnpm build: passes.

https://claude.ai/code/session_019zws4ceJu2jctk3XT48fMX

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	launchpad	9c8a844	Commit Preview URL Branch Preview URL	Oct 10 2026, 10:26 PM