Add InfluxDB v2 on skydick for fleet monitoring
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- New modules/influxdb.nix: declarative InfluxDB v2 with ZFS-backed
storage (dick/system/influxdb, bind-mounted to /var/lib/influxdb2)
- monitoring.nix: make influxUrl configurable (default: skydick)
- skydick/default.nix: enable influxdb, point telegraf to localhost
- datapool.nix: document influxdb dataset in hierarchy + creation cmds
Consolidates all monitoring data (door1 + skydick + IoT sensors) into
a single InfluxDB on the ZFS storage server for infinite retention.
Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>