merge

type Options struct {
	ClientPath  string
	ServerPath  string
	TXTOutPath  string // 为空则写 client.csv 同目录 report.txt
	JSONOutPath string // 非空则写入 JSON
	HumanWriter io.Writer
}

type Result struct {
	Delay1AvgMs      float64
	Delay2AvgMs      float64
	Delay1Samples    int
	Delay2Samples    int
	Loss1            float64
	Loss2            float64
	BW1Mbps          float64
	BW2Mbps          float64
	ULSent           int64
	ULRecv           int64
	DLSent           int64
	DLRecv           int64
	ULUnderflowCount int64
	ULOverflowCount  int64
	DLUnderflowCount int64
	DLOverflowCount  int64
}