Adds a `source` template variable to the training dashboard that controls
which Prometheus job labels are queried:
- Live: only `training-pods` (running pods scraped directly)
- CI History: only `.*_baseline.*` (completed CI runs via pushgateway)
- All: both sources combined
All 37 panel queries now use `job=~"$source"` for consistent filtering.
Active Workers panel stays hardcoded to `job="training-pods"` since it
only makes sense for live pods. Template variable queries (model/fold
dropdowns) also respect the source selector.
Default is "Live" — dashboard shows only the currently running training
session with no pushgateway stale data contamination.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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