feat(analytics): add time-series aggregation pipeline with hourly and daily rollups

[Nexha-dev]

Closes #768

Summary

Adds an incremental time-series aggregation pipeline that pre-computes hourly (1h) and daily (24h) rollups of deployment analytics, enabling fast dashboard queries without full table scans.

Changes

• Migration 016_analytics_rollups.sql — analytics_rollups table (unique on deployment_id, metric_type, granularity, bucket_start) plus a rollup_cursors table tracking last-aggregated time per granularity, with RLS policies.
• analytics-aggregation.service.ts — incremental rollup: reads the cursor, fetches only new deployment_analytics rows since the cursor, groups them into time buckets, upserts (idempotent recompute), and advances the cursor.
• /api/cron/aggregate-analytics/route.ts — cron-authenticated endpoint that runs both 1h and 24h aggregations (intended to run hourly).
• Tests for incremental aggregation, hourly/daily bucket assignment, up_count for uptime checks, empty-cursor no-op, and idempotency.

Notes

• Rollup granularities: 1h and 24h. Incremental — only new events since the last run are aggregated.

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