⚡ Bolt: OOM protection for L1 cache & fetchOptions allocation optimization

[suranig]

💡 What: Introduced a maximum capacity (MAX_L1_CACHE_SIZE = 1000) for the L1 in-memory cache with a FIFO eviction strategy. Also optimized the object allocation of fetchOptions to avoid unnecessary object spread operations on cache fetches.

🎯 Why: The L1 Map cache lacked any bounds limit, allowing it to potentially grow unbounded over time and lead to memory exhaustion (OOM), which poses a DoS risk in long-running processes or on highly dynamic routes with high cache miss variance. The object spread optimization reduces unnecessary garbage collection overhead on the very hot fetch path.

📊 Impact: Restricts memory footprint to a strict maximum limit, ensuring stability. CPU overhead is slightly reduced per cache fetch call when custom options are omitted.

🔬 Measurement: Run the new L1 cache eviction tests using npm run test and check that the tests verify the oldest entries are purged as expected. Memory footprint can be measured and will no longer grow beyond ~1000 concurrent L1 keys.

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PR created automatically by Jules for task 12425408148880868313 started by @suranig

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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