Server performance audit

[kentcdodds]

Adds server-side performance logging and HTTP endpoint benchmarking tools to identify bottlenecks after recent dependency updates.

Test Plan

1. Start the application: bun run dev
2. Run the server benchmark:
   "$HOME/.bun/bin/bun" ./scripts/benchmark-server.ts --iterations 20 --concurrency 4 --output /opt/cursor/artifacts/benchmark-server.json | tee /opt/cursor/artifacts/benchmark-server.log
3. Run the database performance benchmark:
   "$HOME/.bun/bin/bun" ./scripts/benchmark-performance.ts --iterations 3 | tee /opt/cursor/artifacts/benchmark-performance.log
4. Enable PERF_LOGGING=true in .env and observe server logs for server-perf: entries to monitor request metrics (CPU, ELU, memory, duration).

Checklist

• Tests updated (new benchmark scripts added)
• Docs updated (new docs/server-performance-audit.md added)

Screenshots

N/A (server-side changes and text-based benchmark outputs)

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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