设备管理模块方法转换为DTO模式，修复long类型接收雪花ID丢失精度的问题

Model/Mapper/EntityMapper.cs

@@ -26,7 +26,7 @@ namespace Model.Mapper
                 CreateTime = entity.CreateTime,
                 Code = entity.Code,
                 Name = entity.Name,
-                CategoryId = entity.CategoryId,
+                CategoryId = entity.CategoryId.ToString(),
                 Type = entity.Type,
                 Brand = entity.Brand,
                 Model = entity.Model,
@@ -71,6 +71,54 @@ namespace Model.Mapper
         {
             return entities?.Select(e => e.ToDto()).ToList() ?? new List<EquipmentDto>();
         }
+
+        /// <summary>
+        /// EquipmentDto → EquipmentEntity（入参映射，用于新增/修改）
+        /// 安全约定：IsDel/CreateTime/UpdateTime 等服务端管控字段刻意不映射，防止过度绑定（over-binding）；
+        /// Id 解析失败时为 0（新增时由雪花算法自动生成）
+        /// </summary>
+        public static EquipmentEntity ToEntity(this EquipmentDto dto)
+        {
+            if (dto == null) return null;
+            return new EquipmentEntity
+            {
+                Id = long.TryParse(dto.Id, out var id) ? id : 0,
+                Code = dto.Code,
+                Name = dto.Name,
+                CategoryId = long.TryParse(dto.CategoryId, out var categoryId) ? categoryId : 0,
+                Type = dto.Type,
+                Brand = dto.Brand,
+                Model = dto.Model,
+                Specifications = dto.Specifications,
+                Manufacturer = dto.Manufacturer,
+                Supplier = dto.Supplier,
+                ImageUrl = dto.ImageUrl,
+                QrCode = dto.QrCode,
+                Description = dto.Description,
+                Department = dto.Department,
+                Location = dto.Location,
+                ResponsiblePerson = dto.ResponsiblePerson,
+                ContactPhone = dto.ContactPhone,
+                Custodian = dto.Custodian,
+                PurchaseDate = dto.PurchaseDate,
+                PurchasePrice = dto.PurchasePrice,
+                WarrantyExpireDate = dto.WarrantyExpireDate,
+                AcceptanceDate = dto.AcceptanceDate,
+                EnableDate = dto.EnableDate,
+                ServiceLifeYears = dto.ServiceLifeYears,
+                ScrapDate = dto.ScrapDate,
+                Status = dto.Status,
+                CalibrationStatus = dto.CalibrationStatus,
+                LastCalibrationDate = dto.LastCalibrationDate,
+                NextCalibrationDate = dto.NextCalibrationDate,
+                InspectionDate = dto.InspectionDate,
+                NextInspectionDate = dto.NextInspectionDate,
+                MaintenanceStatus = dto.MaintenanceStatus,
+                LastMaintenanceDate = dto.LastMaintenanceDate,
+                NextMaintenanceDate = dto.NextMaintenanceDate,
+                Remark = dto.Remark
+            };
+        }
         #endregion
 
         #region 设备附件
@@ -85,7 +133,7 @@ namespace Model.Mapper
                 Id = entity.Id.ToString(),
                 IsDel = entity.IsDel,
                 CreateTime = entity.CreateTime,
-                EquipmentId = entity.EquipmentId,
+                EquipmentId = entity.EquipmentId.ToString(),
                 FileName = entity.FileName,
                 FileType = entity.FileType,
                 FileExt = entity.FileExt,
@@ -117,7 +165,7 @@ namespace Model.Mapper
                 Id = entity.Id.ToString(),
                 IsDel = entity.IsDel,
                 CreateTime = entity.CreateTime,
-                ParentId = entity.ParentId,
+                ParentId = entity.ParentId.ToString(),
                 Name = entity.Name,
                 Code = entity.Code,
                 Level = entity.Level,
@@ -147,7 +195,7 @@ namespace Model.Mapper
                 Id = entity.Id.ToString(),
                 IsDel = entity.IsDel,
                 CreateTime = entity.CreateTime,
-                EquipmentId = entity.EquipmentId,
+                EquipmentId = entity.EquipmentId.ToString(),
                 FromStatus = entity.FromStatus,
                 ToStatus = entity.ToStatus,
                 ChangeTime = entity.ChangeTime,