- Add GetQueueDepthByLabels function to query waiting jobs by labels
- Add QueueDepthJSON endpoint to return queue depth data
- Update runner_list.tmpl to show queue depth with visual indicators
- Show warnings for jobs waiting > 30 minutes (stuck jobs)
- Labels colored by severity: blue (normal), yellow (>5 waiting), red (stuck)
- Add queue_depth locale string
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>