feat: add admin menu management crud

src/Application/TakeoutSaaS.Application/Identity/Handlers/DeleteMenuCommandHandler.cs

@@ -0,0 +1,29 @@
+using MediatR;
+using TakeoutSaaS.Application.Identity.Commands;
+using TakeoutSaaS.Domain.Identity.Repositories;
+using TakeoutSaaS.Shared.Abstractions.Tenancy;
+
+namespace TakeoutSaaS.Application.Identity.Handlers;
+
+/// <summary>
+/// 删除菜单处理器。
+/// </summary>
+public sealed class DeleteMenuCommandHandler(
+    IMenuRepository menuRepository,
+    ITenantProvider tenantProvider)
+    : IRequestHandler<DeleteMenuCommand, bool>
+{
+    /// <inheritdoc />
+    public async Task<bool> Handle(DeleteMenuCommand request, CancellationToken cancellationToken)
+    {
+        // 1. 删除目标及可能的孤儿由外层保证
+        var tenantId = tenantProvider.GetCurrentTenantId();
+        await menuRepository.DeleteAsync(request.Id, tenantId, cancellationToken);
+
+        // 2. 持久化
+        await menuRepository.SaveChangesAsync(cancellationToken);
+
+        // 3. 返回执行结果
+        return true;
+    }
+}