refactor(docs): adapt server routes to b24jssdk (were copied from b24ui)

[IgorShevchik]

Refs #133.

Problem

The handlers under docs/server/routes/ were copied from the sibling b24ui project and never adapted to b24jssdk. The most visible consequence: raw/index.md (the raw-markdown surface consumed by LLMs / AI agents at /raw/index.md) described the wrong product — it advertised "Bitrix24 UI… a Vue UI component library… 125+ Tailwind CSS components", linked to components.md / composables / typography pages that don't exist here, and pointed GitHub: at github.com/bitrix24/b24ui.

Changes (scope = docs/server/routes/ per the issue)

• raw/index.md.get.ts — rewrite the hardcoded landing body to describe @bitrix24/b24jssdk (the REST API SDK):
  • correct title / description (sourced from the repo's own index.yml + nuxt-llms config);
  • SDK feature list (B24Frame / B24Hook / B24OAuth, REST v2/v3, batch, helpers, logging, TS);
  • real installation pages (vue / nuxt / react / nodejs / umd);
  • real sections + entry points (getting-started, working-with-the-rest-api, frame / hook / oauth);
  • GitHub: → github.com/bitrix24/b24jssdk; EN/RU community links (resolves the inline @todo);
  • drop the stale // …/b24ui DOMAIN comment.
• raw/[...slug].md.get.ts — drop the stale // …/b24ui comment; fold the two duplicated not-found responses into a single notFound() helper.
• sitemap.xml.get.ts — drop the stale // …/b24ui comment.
• sitemap.md.get.ts — audited: already b24jssdk-correct (section labels match real content), no change.

Verification

• ✅ No b24ui reference remains anywhere under docs/server/routes/.
• ⏳ The server routes compile under the docs-build (nuxt generate) and typecheck CI jobs on this PR — that's the authoritative check in the Nuxt/Nitro context (a fresh checkout here isn't provisioned for a local nuxt typecheck).

📝 Please eyeball the new index.md wording/links — it's public, LLM-facing content; happy to tweak the feature bullets or link set.

Out of scope (proposed follow-ups)

• Residual b24ui cruft in docs/server/utils/transformMDC.ts (dead commented component-* code, components-list querying /docs/components/%).
• The RU documentation mirror (checklist item 2 of refactor(docs): rework all files under docs/server/routes #133) — separate surface; this repo is English-only.

https://claude.ai/code/session_01977J3EFoxeffXCHS2TE7Kw

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