docs(server): document kura_usage_events in data-export.md

Follow-up from #10979 (Cache usage dashboard).

That PR added the kura_usage_events ClickHouse table and the supporting Tuist.Kura.Usage ingest path, but did not update server/data-export.md so the data-export inventory stays complete for GDPR / CCPA exports.

What needs documenting

In the Analytics Data (ClickHouse) section of server/data-export.md, add:

• Kura usage rollups (kura_usage_events table): per-hour usage rollups pushed by managed Kura nodes for the account. Columns:
  • event_id — deterministic dedupe key
  • account_id, project_id — Tuist identifiers (zero when the handle didn’t resolve at ingest)
  • node_id, region — which cache node served the traffic
  • traffic_plane, direction, operation, protocol, artifact_kind — classification
  • bytes, request_count — metered totals
  • window_start, window_seconds, inserted_at — window timing
  • retention: same as other ingest_repo rollups (partitioned monthly on window_start)

Surface this under “Exportable Data” alongside the existing analytics tables.

Why a follow-up

Was kept out of #10979 at @pepicrft’s request to keep that PR scoped. Tracking it here so the export inventory doesn’t drift.

cc @fortmarek

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