번호 자동 부여 대응 및 API 공통 처리 보강

lib/features/approvals/domain/entities/approval.dart

@@ -204,14 +204,12 @@ extension ApprovalStepActionTypeX on ApprovalStepActionType {
 class ApprovalCreateInput {
   ApprovalCreateInput({
     required this.transactionId,
-    required this.approvalNo,
     required this.approvalStatusId,
     required this.requestedById,
     this.note,
   });
 
   final int transactionId;
-  final String approvalNo;
   final int approvalStatusId;
   final int requestedById;
   final String? note;
@@ -220,7 +218,6 @@ class ApprovalCreateInput {
     final trimmedNote = note?.trim();
     return {
       'transaction_id': transactionId,
-      'approval_no': approvalNo,
       'approval_status_id': approvalStatusId,
       'requested_by_id': requestedById,
       if (trimmedNote != null && trimmedNote.isNotEmpty) 'note': trimmedNote,