[Yiming1997]

Add WithPanicHandler so callers can supply a custom callback invoked when a task panics inside a worker, replacing the default logger-based reporting.

Added:

• PanicHandler type func(task Task, recovered any, stack []byte) and the WithPanicHandler config option in config.go
• Pool.panicHandler field, initialized from config in NewPool
• Pool.handlePanic: delegates to the configured handler, or falls back to the previous "worker exits from panic" log line when none is set, and recovers a panicking handler so the worker goroutine survives

Changed:

• worker.runTask now reports recovered panics via pool.handlePanic instead of logging directly

Tests:

• Custom handler: receives the exact panicking task, the recovered value and a non-empty stack; the worker keeps serving subsequent tasks
• Panicking handler is recovered and Wait() still returns

Docs:

• Document WithPanicHandler in the README options table