feat: 实现字典管理后端

src/Application/TakeoutSaaS.Application/Dictionary/Contracts/DictionaryOverrideSortOrderRequest.cs

@@ -0,0 +1,15 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace TakeoutSaaS.Application.Dictionary.Contracts;
+
+/// <summary>
+/// 更新字典覆盖排序请求。
+/// </summary>
+public sealed class DictionaryOverrideSortOrderRequest
+{
+    /// <summary>
+    /// 排序配置（字典项 ID -> 排序值）。
+    /// </summary>
+    [Required]
+    public Dictionary<long, int> SortOrder { get; set; } = new();
+}