feat(analytics): deepen analytics rollups — aggregation, summary dashboard, top metrics
- types.ts: add AggregateRollupsSchema, SummaryQuerySchema, TopMetricsSchema, AnalyticsSummary
- repository.ts: add aggregateDailyToWeekly, aggregateDailyToMonthly (merge daily rollups)
- repository.ts: add getSummary (trend + top metrics over N days), getTopMetrics (per-date)
- routes.ts: 3 new endpoints — POST /analytics/aggregate, GET /analytics/summary, GET /analytics/top-metrics
- analytics.test.ts: 11 new tests (25 total) for aggregate, summary, top-metrics schemas
- Existing 14 tests unchanged