HelixObs / herald / 26261316771

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feat: genericize data monitor — replace CHIME plugin system with user-configurable fields

Remove CHIME-specific chimeDMPlot/chimeBeamPlot plugins and the entire
plugin registry. The monitor now bins any metadata field against time,
with an optional weight field controlling Inferno colormap brightness.

- monitor/plugin.go: drop Plugin interface, registry, Get/AllConfigs/MetadataFilter;
  rewrite Bin() to accept yField/weightField strings; rename SNR→Weight in wire types;
  add ValidateFieldName() for injection-safe key validation
- monitor/chime.go: deleted
- db/db.go: add QueryMetadataKeys — SELECT DISTINCT jsonb_object_keys(metadata)
  for an instrument in the last 24h (up to 200 keys)
- api/handler.go: add GET /api/v1/monitor/fields endpoint; replace plot= param
  with y_field= + weight_field= in monitorBins; update MonitorStore interface
- tests updated throughout

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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