feat: add admin menu management crud

src/Application/TakeoutSaaS.Application/Identity/Queries/ListMenusQuery.cs

@@ -0,0 +1,12 @@
+using MediatR;
+using System.Collections.Generic;
+using TakeoutSaaS.Application.Identity.Contracts;
+
+namespace TakeoutSaaS.Application.Identity.Queries;
+
+/// <summary>
+/// 查询菜单列表（当前租户）。
+/// </summary>
+public sealed class ListMenusQuery : IRequest<IReadOnlyList<MenuDefinitionDto>>
+{
+}

src/Application/TakeoutSaaS.Application/Identity/Queries/MenuDetailQuery.cs

@@ -0,0 +1,15 @@
+using MediatR;
+using TakeoutSaaS.Application.Identity.Contracts;
+
+namespace TakeoutSaaS.Application.Identity.Queries;
+
+/// <summary>
+/// 菜单详情查询。
+/// </summary>
+public sealed class MenuDetailQuery : IRequest<MenuDefinitionDto?>
+{
+    /// <summary>
+    /// 菜单 ID。
+    /// </summary>
+    public long Id { get; init; }
+}