feat(dashboard): set Trip Matching visualization to Stacked Area

[anant-shipit]

Fixes #104

Design Decisions Summary

Grouping & Panel Choice:
Grouped under "Matching Quality", the default timeseries displayed raw counts alongside ratio percentages on the same y-axis scale, severely warping the chart.

Visualization Rationale:
I chose a Stacked Area Time Series. Stacking matched over unmatched trips as filled areas reveals total realtime volume while simultaneously indicating the match proportion. The match ratio was explicitly overridden to render as a distinct line on a secondary right-side y-axis for precise reading.

Go Metric Modifications:
No Go metric types were modified.

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• grafana/dashboards/watchdog_metrics_dashboard.json

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