perf(dev): optimize dev server boot time with lazy loading
- Enable V8 compile cache for Node.js 22+ to cache compiled bytecode
- Eliminate IPC handshake latency by passing worker options via env
- Extract next-test constants to avoid eager loading of heavy modules
- Lazy load telemetry, config, findPagesDir in next-dev.ts
- Split webpack layer utilities to avoid loading heavy build/utils.ts
- Extract getSupportedBrowsers to lightweight module
These changes reduce cold start time by ~100-200ms.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
