Backend: /api/admin/* blueprint with user CRUD (list, get, update,
disable/enable), usage summary aggregation (group by user/model/feature/
day/focus_group), usage event drill-down, and pricing list. Fixed
admin_required decorator (async-safe). Added find_all/count/update
helpers to User model.
Frontend: /admin page (AdminRoute guard, 3 tabs) — Users table with
search/filter/edit dialog, Usage tab with KPI cards + bar chart +
events table, Pricing tab showing active model rows with tier details.
Admin nav link visible only to admin role.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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