Implement Phase 3 usage statistics API
- Add GET /api/admin/stats/overview (user counts, login stats) - Add GET /api/admin/stats/active-users (time series with period toggle) - Add GET /api/admin/stats/actions (action breakdown with date filter) - Add GET /api/admin/stats/peak-times (hourly/daily averages) - Implement 5-minute in-memory caching for expensive aggregations - All 57 Phase 3 tests passing
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