⚡ Bolt: cache traffic dashboard metrics query

[zaydiscold]

💡 What: Added an in-memory cache for traffic dashboard metrics query.
🎯 Why: Frequent polling of the traffic dashboard caused unnecessary repeated DB queries (prisma.requestLog.groupBy).
📊 Impact: Reduces database load significantly on high-frequency polled endpoints by eliminating redundant aggregate DB queries. Metrics are delayed by at most 15 seconds, which is perfectly acceptable for traffic metrics.
🔬 Measurement: Run the traffic dashboard and observe fewer slow queries hitting the database.

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PR created automatically by Jules for task 3233382284185312526 started by @zaydiscold

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