完善系统参数配置和数据字典管理模块

Model/Dto/System/DictDto.cs

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+namespace Model.Dto.System
+{
+    /// <summary>
+    /// 数据字典分类 DTO
+    /// </summary>
+    public class DictTypeDto
+    {
+        public string Id { get; set; }
+        public string Code { get; set; }
+        public string Name { get; set; }
+        public byte Status { get; set; }
+        public int Sort { get; set; }
+        public string? Remark { get; set; }
+        public DateTime? CreateTime { get; set; }
+        /// <summary>该分类下的字典项数量（列表展示用，由 Service 填充）</summary>
+        public int ItemCount { get; set; }
+    }
+
+    /// <summary>
+    /// 数据字典项 DTO
+    /// </summary>
+    public class DictItemDto
+    {
+        public string Id { get; set; }
+        public string TypeId { get; set; }
+        public string Code { get; set; }
+        public string Name { get; set; }
+        public int Sort { get; set; }
+        public byte Status { get; set; }
+        public byte IsDefault { get; set; }
+        public string? Remark { get; set; }
+        public DateTime? CreateTime { get; set; }
+    }
+
+    /// <summary>
+    /// 字典项下拉选项（业务侧通过 typeCode 查询用：仅返回编码+文本+是否默认）
+    /// </summary>
+    public class DictOptionDto
+    {
+        public string Code { get; set; }
+        public string Name { get; set; }
+        public bool IsDefault { get; set; }
+    }
+}