perf(dev): bundle dev server with webpack and add bytecode caching
- Bundle start-server.ts and dependencies with webpack for faster loading
- Add V8 bytecode caching to cache compiled code between runs
- Bytecode cache includes JIT warmup for optimal performance
- Cache stored in .next/cache/bytecode/ with automatic invalidation
This further reduces warm start time by ~50-100ms.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>