fix: async init aria2 to optimize start duration

internal/bootstrap/aria2.go

@@ -6,9 +6,11 @@ import (
 )
 
 func InitAria2() {
+	go func() {
 		_, err := aria2.InitClient(2)
 		if err != nil {
 			//utils.Log.Errorf("failed to init aria2 client: %+v", err)
 			utils.Log.Infof("Aria2 not ready.")
 		}
+	}()
 }