chore(launch-prep): hide unfinished report/import surfaces, defer big builds

Ship-what's-done prep ahead of the prod cutover (launch ~today):

- Hide Financial + Marketing report cards from the reports landing
  (both were "Builder in development" placeholders gated on unbuilt
  data sources). Sales/Operational/Custom + templates/scheduling/
  exports remain live.
- Trim the Custom-report card copy to match the shipped basic builder
  (no group-by/filters yet; the builder page header was already honest).
- Hide the Bulk Import mockup from search-nav-catalog + the admin
  sections browser; /admin/import is now unreachable from the UI.
- Correct client-facing doc over-claims (waiting-list "next-in-line
  notification", Import) in features-list.md + new-system-feature-summary.md.
- Un-stale BACKLOG.md (Documenso phases 2-7 confirmed shipped).
- Log decisions + deferred work (full importer, full custom-builder,
  waiting-list, maintenance-log, paper-upload bug) to launch-readiness.md.

Deferred-importer design spec added at
docs/superpowers/specs/2026-06-01-bulk-import-design.md.

Verified: tsc --noEmit clean, eslint clean on changed files,
1512/1519 vitest pass (7 failures are Redis-down, unrelated).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/lib/services/search-nav-catalog.ts

@@ -352,12 +352,6 @@ export const NAV_CATALOG: NavCatalogEntry[] = [
     category: 'admin',
     keywords: ['dedup', 'duplicate clients', 'merge', 'review queue'],
   },
-  {
-    href: '/:portSlug/admin/import',
-    label: 'Bulk import',
-    category: 'admin',
-    keywords: ['csv', 'import', 'bulk upload'],
-  },
   {
     href: '/:portSlug/admin/sends',
     label: 'Send log',