Revert "refactor: replace DeepCopy with Copy for request handling consistency"

This reverts commit c21219fcff.

common/copy.go

@@ -6,21 +6,14 @@ import (
 	"github.com/jinzhu/copier"
 )
 
-func Copy[T any](src *T, deepCopy bool) (*T, error) {
+func DeepCopy[T any](src *T) (*T, error) {
 	if src == nil {
 		return nil, fmt.Errorf("copy source cannot be nil")
 	}
 	var dst T
-	if deepCopy {
-		err := copier.CopyWithOption(&dst, src, copier.Option{DeepCopy: true, IgnoreEmpty: true})
-		if err != nil {
-			return nil, err
-		}
-	} else {
-		err := copier.Copy(&dst, src)
-		if err != nil {
-			return nil, err
-		}
+	err := copier.CopyWithOption(&dst, src, copier.Option{DeepCopy: true, IgnoreEmpty: true})
+	if err != nil {
+		return nil, err
 	}
 	return &dst, nil
 }