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

service/exec/exec.go

@@ -85,7 +85,7 @@ func (dc *dockerContainer) CreateAndStartContainer() error {
 	}
 	// 如果容器已经存在，则跳过创建
 	if dc.ContainerID != "" {
-		fmt.Println("Container already exists, skipping creation.")
+		log.Printf("Container already exists, skipping creation.")
 		return nil
 	}
 
@@ -128,7 +128,7 @@ func (dc *dockerContainer) CreateAndStartContainer() error {
 		return err
 	}
 
-	fmt.Println("Container created and started, waiting for commands...")
+	log.Printf("Container created and started, waiting for commands...")
 	return nil
 }
 
@@ -218,7 +218,7 @@ func (dc *dockerContainer) RestartAndCleanContainer() error {
 		return err
 	}
 
-	fmt.Println("Container restarted and cleaned.")
+	log.Printf("Container restarted and cleaned.")
 	return nil
 }
 
@@ -243,6 +243,6 @@ func (dc *dockerContainer) RemoveContainer() error {
 		return err
 	}
 
-	fmt.Println("Container removed.")
+	log.Printf("Container removed.")
 	return nil
 }