refactor: 将多个 fmt.Println 日志替换为 log.Printf，以统一日志输出格式并提升可读性

handler/newbond/service.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
+	"log"
 	"net/http"
 	"time"
 
@@ -127,26 +128,26 @@ func GetGroupListens() ([]int, error) {
 }
 
 func RoundCheckNewBond() {
-	time.Sleep(5 * time.Second)
+	time.Sleep(5 * time.Minute)
 	for !action.ActionManager.Started() {
-		time.Sleep(5 * time.Second)
+		time.Sleep(5 * time.Minute)
 	}
 	// once := true
 	util.AddCycleTask("checkNewBond", 5*time.Minute, 5*time.Minute, func() {
 		bonds, err := GetBondsData()
 		if bonds == nil || err != nil {
-			fmt.Println("Error getting bonds data:", err)
+			log.Printf("Error getting bonds data: %v\n", err)
 			return
 		}
 		groups, err := GetGroupListens()
 		if err != nil {
-			fmt.Println("Error getting group listens:", err)
+			log.Printf("Error getting group listens: %v\n", err)
 			return
 		}
 		for _, bond := range bonds {
 			exists, err := BondDataExists(bond.SecurityCode)
 			if err != nil {
-				fmt.Println("Error checking bond data exists:", err)
+				log.Printf("Error checking bond data exists: %v\n", err)
 				return
 			}
 			if !exists {