⚡ Bolt: optimize USNI fleet merging to O(N+M)

[garridolecca]

💡 What: Optimized the data merging logic in src/services/usni-fleet.ts (mergeUSNIWithAIS) to use Map-indexed lookups and filtered arrays, reducing algorithmic complexity from O(N*M) to O(N+M).
🎯 Why: The previous implementation used nested loops over AIS vessels and USNI fleet entries, which scales poorly and becomes a CPU bottleneck when fleet data is large.
📊 Impact: Significantly reduces CPU overhead during the USNI fleet synchronization cycle by eliminating repetitive data structure traversals and avoiding continuous execution of heavy string transformations (e.g. toUpperCase, replace).
🔬 Measurement: Verify tests run properly via npm run test:sidecar, npm run test:data, and npm run typecheck. You can also profile the time taken to execute mergeUSNIWithAIS with large inputs.

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PR created automatically by Jules for task 3013756185528641729 started by @garridolecca

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