refactor: reorganize Admin page — 8 focused tabs, grouped system tools
Restructured the overloaded 6-tab Admin page into 8 focused tabs:
1. Overview — pricing summary (unchanged)
2. Users — user CRUD (unchanged)
3. Render Settings — engine, samples, tessellation, viewer config only
4. Output Types — OutputTypeTable (extracted from old Pricing tab)
5. Templates & Positions — render templates + camera positions + material lib
6. Pricing — pricing tiers only (cleaned up)
7. Libraries — asset libraries + template editor (unchanged)
8. System Tools — ALL maintenance buttons organized into cards:
- Reprocessing (stuck recovery, thumbnails, metadata, workflows)
- USD/Canonical Scenes (missing masters, regenerate all)
- Cleanup (orphaned media/STEP, purge renders)
- GPU Status, SMTP, Dashboard Config
Section header pattern (icon + title + description) for each section.
Card pattern for grouped maintenance actions.
Scrollable tab bar for smaller screens.
No sub-components changed — only Admin.tsx reorganization.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
HartmutandClaude Opus 4.6
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