feat: 套餐管理与配额校验能力

src/Application/TakeoutSaaS.Application/App/Tenants/Handlers/SearchTenantPackagesQueryHandler.cs

@@ -0,0 +1,33 @@
+using System.Linq;
+using MediatR;
+using TakeoutSaaS.Application.App.Tenants.Dto;
+using TakeoutSaaS.Application.App.Tenants.Queries;
+using TakeoutSaaS.Domain.Tenants.Repositories;
+using TakeoutSaaS.Shared.Abstractions.Results;
+
+namespace TakeoutSaaS.Application.App.Tenants.Handlers;
+
+/// <summary>
+/// 套餐分页查询处理器。
+/// </summary>
+public sealed class SearchTenantPackagesQueryHandler(ITenantPackageRepository packageRepository)
+    : IRequestHandler<SearchTenantPackagesQuery, PagedResult<TenantPackageDto>>
+{
+    /// <inheritdoc />
+    public async Task<PagedResult<TenantPackageDto>> Handle(SearchTenantPackagesQuery request, CancellationToken cancellationToken)
+    {
+        var packages = await packageRepository.SearchAsync(request.Keyword, request.IsActive, cancellationToken);
+
+        var ordered = packages.OrderByDescending(x => x.CreatedAt).ToList();
+        var pageIndex = request.Page <= 0 ? 1 : request.Page;
+        var size = request.PageSize <= 0 ? 20 : request.PageSize;
+
+        var pagedItems = ordered
+            .Skip((pageIndex - 1) * size)
+            .Take(size)
+            .Select(x => x.ToDto())
+            .ToList();
+
+        return new PagedResult<TenantPackageDto>(pagedItems, pageIndex, size, ordered.Count);
+    }
+}