refactor: rename features to room-based directory structure
- Rename features/dashboard → features/front_hall
- Update routes: /, /control-room, /parlor, /settings
- Update navigation to 4 rooms (removed chat tab - will be omnipresent dock)
- Add docs/UI_LAYOUT.md with wireframes and responsive specs
- Update ARCHITECTURE.md and PLAN.md to reflect room structure
Directory structure now mirrors "Rooms of the Estate" UI navigation:
- front_hall/ (dashboard)
- control_room/ (infrastructure - containers, stacks, etc.)
- parlor/ (home automation)
- library/ (future)
- study/ (future, hidden)
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>