feat(boltbot): add audit dashboard — Vite + React SPA served from gateway
Adds a dark-themed receipt audit dashboard at /boltbot/dashboard:
- Vite + React + TypeScript SPA with Tailwind CSS
- Stats summary (total actions, tier breakdown, anomaly count)
- Receipt list with tier/anomaly filtering, offset pagination, 10s polling
- Slide-out receipt detail with accordion sections (hashes, EigenDA, TEE)
- Session grouping view (receipts grouped by sessionKey)
- Gateway serves static files via registerHttpRoute with path traversal
protection (resolve+startsWith), security headers (nosniff, DENY)
- WCAG-compliant: dialog focus management, keyboard navigation,
aria-pressed/expanded/selected, semantic table roles, contrast AA
58e556a2d7