feat(dashboard): enhance Vehicle Volume time series visualization

[anant-shipit]

Fixes #100

Design Decisions Summary

Grouping & Panel Choice:
Grouped under "Realtime Feed Health", this panel needs to display historical trends, but the raw timeseries lacked clear distinction between the overlaid metrics.

Visualization Rationale:
I retained the Time Series visualization but added distinct field configurations (line width, fill opacity) and explicit legend formats. Overlaying the GTFS-RT feed count directly against the API output count on a time series line chart allows operators to immediately spot ingestion drops or system divergence from the historical daily baseline.

Go Metric Modifications:
No Go metric types were modified.

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Reviewing files that changed from the base of the PR and between af77c99 and 9381ca5.

📒 Files selected for processing (1)

• grafana/dashboards/watchdog_metrics_dashboard.json

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[coveralls]

coverage: 51.344%. remained the same — anant-shipit:feat/issue-100-vehicle-volume into OneBusAway:main