feat(dashboard): set Spatial Validation visualization to Bar Gauge

[anant-shipit]

Fixes #108

Design Decisions Summary

Grouping & Panel Choice:
Grouped under "Vehicle Anomalies", the default timeseries made it difficult to quickly spot which specific server was emitting the most out-of-bounds coordinate errors.

Visualization Rationale:
I chose a horizontal Bar Gauge. Grouping by server using a bar gauge instantly surfaces which specific data pipeline is emitting the most malformed coordinates. Color thresholds (green=0, yellow>=1, red>=5) provide immediate visual alerting.

Go Metric Modifications:
No Go metric types were modified.

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• grafana/dashboards/watchdog_metrics_dashboard.json

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