#224 Add generated sitemap audit

Summary

• Add docs/site-map.md as the tracked Clinical KB sitemap.
• Add scripts/generate-site-map.ts with sitemap:update and sitemap:check commands.
• Add static sitemap coverage tests for pages, API routes, seeded dynamic slugs, navigation links, redirects, and known caveats.
• Redirect /mockups/favourites-hub to /favourites and document route/navigation sitemap checks in docs/process-hardening.md.

Verification

• npm run sitemap:update
• npm run sitemap:check
• npm run test -- tests/site-map.test.ts tests/app-modes.test.ts tests/services.test.ts tests/forms.test.ts tests/differentials.test.ts
• npm run typecheck
• npm run lint
• npm run verify:cheap
• npm run test:e2e:chromium -- tests/ui-tools.spec.ts (32 passed)

Notes

• PR branch was isolated from origin/main so this PR contains only the sitemap audit commit.
• No runtime dependencies or database migrations are included.