docs: consolidate scattered docs into canonical set
Replace ~35 organically-grown docs (docs/platform/*, docs/backend-platform/*, one-off sprint reports, Search.md, Diagnostics.md, Content-Management.md, Backend-Handoff-Sprint16.md, docs/superpowers/*, docs/Project-Editor.md, untracked docs/total.md) with the six canonical docs declared in .claude/CLAUDE.md: PROJECT.md, ARCHITECTURE.md, BACKEND.md, FRONTEND.md, BOOTSTRAP.md, EDITOR.md, plus a new PROJECT-STRUCTURE.md. - BACKEND.md is a punch list per domain (auth, bootstrap draft/publish, static pages, categories, products, orders, dashboard metrics, activity, translations, search, product engagement) plus a Known reliability issues section on the prod 502/504 root cause. - ARCHITECTURE.md links to (does not duplicate) the enforced docs/architecture/foundation/** ADRs and standards docs. - docs/ADMIN.md and docs/architecture/foundation/** and docs/context/** are left untouched per instructions. - Updated the one dangling docs/Project-Editor.md reference in admin-auth.service.ts to point at docs/BACKEND.md. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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