RSDK-13299 — Log occasional warning when capture data is stale

[n0nick]

Summary

• Adds a rate-limited log to the disk summary tracker when the oldest file in the capture directory is significantly older than expected given the sync interval
• Warning fires when oldest file age exceeds 10 × sync_interval_mins (with a minimum of 3 minutes), and at most once every 5 minutes
• Dynamically checks sync state each tick via SchedulerEnabled() and ReadyToSyncDirectories():
  • WARN when sync should be actively happening but data is stale (data generating faster than uploading, or uploads failing)
  • DEBUG when sync is paused (e.g. selective sync sensor returned false) — staleness is expected, no need to alarm
• Uses existing data.FormatBytesI64 for human-readable sizes
• Exports sync.Config.SchedulerEnabled() and sync.ReadyToSyncDirectories()

Example log:

WARN  Capture data may not be syncing: oldest file is 5m0s old, expected less than 3m0s.
There are 42 files (5.00 MB) waiting to sync.
Data may be generating faster than it can be uploaded, or uploads may be failing.

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