feat: migrate snowflake ids and refresh migrations

src/Application/TakeoutSaaS.Application/App/Merchants/Handlers/SearchMerchantsQueryHandler.cs

@@ -0,0 +1,42 @@
+using MediatR;
+using TakeoutSaaS.Application.App.Merchants.Dto;
+using TakeoutSaaS.Application.App.Merchants.Queries;
+using TakeoutSaaS.Domain.Merchants.Repositories;
+using TakeoutSaaS.Shared.Abstractions.Tenancy;
+
+namespace TakeoutSaaS.Application.App.Merchants.Handlers;
+
+/// <summary>
+/// 商户列表查询处理器。
+/// </summary>
+public sealed class SearchMerchantsQueryHandler(
+    IMerchantRepository merchantRepository,
+    ITenantProvider tenantProvider)
+    : IRequestHandler<SearchMerchantsQuery, IReadOnlyList<MerchantDto>>
+{
+    private readonly IMerchantRepository _merchantRepository = merchantRepository;
+    private readonly ITenantProvider _tenantProvider = tenantProvider;
+
+    /// <inheritdoc />
+    public async Task<IReadOnlyList<MerchantDto>> Handle(SearchMerchantsQuery request, CancellationToken cancellationToken)
+    {
+        var tenantId = _tenantProvider.GetCurrentTenantId();
+        var merchants = await _merchantRepository.SearchAsync(tenantId, request.Status, cancellationToken);
+
+        return merchants
+            .Select(merchant => new MerchantDto
+            {
+                Id = merchant.Id,
+                TenantId = merchant.TenantId,
+                BrandName = merchant.BrandName,
+                BrandAlias = merchant.BrandAlias,
+                LogoUrl = merchant.LogoUrl,
+                Category = merchant.Category,
+                ContactPhone = merchant.ContactPhone,
+                ContactEmail = merchant.ContactEmail,
+                Status = merchant.Status,
+                JoinedAt = merchant.JoinedAt
+            })
+            .ToList();
+    }
+}