feat: add operator and business reference fields to tenant ledgers

- Added `operator_user_id`, `biz_ref_type`, and `biz_ref_id` fields to the TenantLedger model for enhanced auditing and traceability.
- Updated the tenant ledgers query generation to include new fields.
- Introduced new API endpoint for retrieving tenant ledger records with filtering options based on the new fields.
- Enhanced Swagger documentation to reflect the new endpoint and its parameters.
- Created DTOs for admin ledger filtering and item representation.
- Implemented the admin ledger retrieval logic in the tenant service.
- Added database migration scripts to introduce new fields and indexes for efficient querying.

backend/app/services/order_test.go

@@ -152,14 +152,14 @@ func (s *OrderTestSuite) Test_AdminTopupUser() {
 			So(orderModel.Status, ShouldEqual, consts.OrderStatusPaid)
 			So(orderModel.AmountPaid, ShouldEqual, 300)
 
-				snap := orderModel.Snapshot.Data()
-				So(snap.Kind, ShouldEqual, string(consts.OrderTypeTopup))
+			snap := orderModel.Snapshot.Data()
+			So(snap.Kind, ShouldEqual, string(consts.OrderTypeTopup))
 
-				var snapData fields.OrdersTopupSnapshot
-				So(json.Unmarshal(snap.Data, &snapData), ShouldBeNil)
-				So(snapData.OperatorUserID, ShouldEqual, operatorUserID)
-				So(snapData.TargetUserID, ShouldEqual, targetUserID)
-				So(snapData.Amount, ShouldEqual, int64(300))
+			var snapData fields.OrdersTopupSnapshot
+			So(json.Unmarshal(snap.Data, &snapData), ShouldBeNil)
+			So(snapData.OperatorUserID, ShouldEqual, operatorUserID)
+			So(snapData.TargetUserID, ShouldEqual, targetUserID)
+			So(snapData.Amount, ShouldEqual, int64(300))
 
 			var tu models.TenantUser
 			So(_db.WithContext(ctx).Where("tenant_id = ? AND user_id = ?", tenantID, targetUserID).First(&tu).Error, ShouldBeNil)