feat(git): add observability for snapshot restore and serve paths#209
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Adds OTel metrics and structured logging to track how repositories are populated on cachew pods (local/mirror/upstream) and how snapshots are served to workstations (cache/live), including duration, bytes, and throughput.
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Adds OTel metrics and structured logging to the snapshot restore and serve paths so we can understand cachew performance in production.
snapshot.Restorenow returns aRestoreResultwith bytes read and duration, which gets logged as structured fields on the "Mirror snapshot extracted" message. New OTel metrics track clone source (local/mirror/upstream), snapshot serve source (cache/live), along with duration, bytes, and throughput histograms — all scraped into Datadog via the existing openmetrics annotation on port 9102.