feat: 管理端核心实体CRUD补齐

src/Application/TakeoutSaaS.Application/App/Payments/Handlers/GetPaymentByIdQueryHandler.cs

@@ -0,0 +1,59 @@
+using MediatR;
+using TakeoutSaaS.Application.App.Payments.Dto;
+using TakeoutSaaS.Application.App.Payments.Queries;
+using TakeoutSaaS.Domain.Payments.Entities;
+using TakeoutSaaS.Domain.Payments.Repositories;
+using TakeoutSaaS.Shared.Abstractions.Tenancy;
+
+namespace TakeoutSaaS.Application.App.Payments.Handlers;
+
+/// <summary>
+/// 支付记录详情查询处理器。
+/// </summary>
+public sealed class GetPaymentByIdQueryHandler(
+    IPaymentRepository paymentRepository,
+    ITenantProvider tenantProvider)
+    : IRequestHandler<GetPaymentByIdQuery, PaymentDto?>
+{
+    private readonly IPaymentRepository _paymentRepository = paymentRepository;
+    private readonly ITenantProvider _tenantProvider = tenantProvider;
+
+    /// <inheritdoc />
+    public async Task<PaymentDto?> Handle(GetPaymentByIdQuery request, CancellationToken cancellationToken)
+    {
+        var tenantId = _tenantProvider.GetCurrentTenantId();
+        var payment = await _paymentRepository.FindByIdAsync(request.PaymentId, tenantId, cancellationToken);
+        if (payment == null)
+        {
+            return null;
+        }
+
+        var refunds = await _paymentRepository.GetRefundsAsync(payment.Id, tenantId, cancellationToken);
+        return MapToDto(payment, refunds);
+    }
+
+    private static PaymentDto MapToDto(PaymentRecord payment, IReadOnlyList<PaymentRefundRecord> refunds) => new()
+    {
+        Id = payment.Id,
+        TenantId = payment.TenantId,
+        OrderId = payment.OrderId,
+        Method = payment.Method,
+        Status = payment.Status,
+        Amount = payment.Amount,
+        TradeNo = payment.TradeNo,
+        ChannelTransactionId = payment.ChannelTransactionId,
+        PaidAt = payment.PaidAt,
+        Remark = payment.Remark,
+        Payload = payment.Payload,
+        Refunds = refunds.Select(x => new PaymentRefundDto
+        {
+            Id = x.Id,
+            PaymentRecordId = x.PaymentRecordId,
+            OrderId = x.OrderId,
+            Amount = x.Amount,
+            ChannelRefundId = x.ChannelRefundId,
+            Status = x.Status,
+            Payload = x.Payload
+        }).ToList()
+    };
+}