设备管理模块Entity添加和controller

Model/Entity/Asset/EquipmentCategoryEntity.cs

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+using SqlSugar;
+
+namespace Model.Entity.Asset
+{
+    /// <summary>
+    /// 设备分类（资产分类：支持按实验室/楼层/部门/位置/产品等多级树形分类，可按类型筛选展示）
+    /// </summary>
+    public class EquipmentCategoryEntity : BaseEntity
+    {
+        /// <summary>
+        /// 父级分类Id（0表示顶级）
+        /// </summary>
+        public long ParentId { get; set; }
+
+        /// <summary>
+        /// 分类名称
+        /// </summary>
+        [SugarColumn(Length = 100)]
+        public string? Name { get; set; }
+
+        /// <summary>
+        /// 分类编码
+        /// </summary>
+        [SugarColumn(Length = 50)]
+        public string? Code { get; set; }
+
+        /// <summary>
+        /// 层级（1级、2级……，便于树形展示与筛选）
+        /// </summary>
+        public int Level { get; set; } = 1;
+
+        /// <summary>
+        /// 排序号
+        /// </summary>
+        public int Sort { get; set; }
+
+        /// <summary>
+        /// 备注
+        /// </summary>
+        [SugarColumn(Length = 500)]
+        public string? Remark { get; set; }
+    }
+}