以下是整合了所有改進點的完整代碼實現：

package mainimport ("bytes""context""fmt""io""log""net/http""sync""time""github.com/go-redis/redis/v8""github.com/robfig/cron/v3""golang.org/x/time/rate"
)// 任務狀態常量
const (StatusReady    = "就緒"StatusRunning  = "運行中"StatusStopped  = "已停止"StatusDisabled = "已禁用"
)// 任務類型常量
const (TaskTypePeriodic = "periodic" // 周期性任務TaskTypeOneShot  = "oneshot"  // 一次性任務
)// API調用結果結構
type APIResult struct {StatusCode int           // HTTP狀態碼Body       string        // 響應體Error      error         // 錯誤信息Duration   time.Duration // 耗時Retries