feat: Mini 桌码扫码上下文接口

src/Application/TakeoutSaaS.Application/App/Stores/Handlers/GetStoreTableContextQueryHandler.cs

@@ -0,0 +1,55 @@
+using MediatR;
+using Microsoft.Extensions.Logging;
+using TakeoutSaaS.Application.App.Stores.Dto;
+using TakeoutSaaS.Application.App.Stores.Queries;
+using TakeoutSaaS.Domain.Stores.Repositories;
+using TakeoutSaaS.Shared.Abstractions.Constants;
+using TakeoutSaaS.Shared.Abstractions.Exceptions;
+using TakeoutSaaS.Shared.Abstractions.Tenancy;
+
+namespace TakeoutSaaS.Application.App.Stores.Handlers;
+
+/// <summary>
+/// 桌码上下文查询处理器。
+/// </summary>
+public sealed class GetStoreTableContextQueryHandler(
+    IStoreRepository storeRepository,
+    ITenantProvider tenantProvider,
+    ILogger<GetStoreTableContextQueryHandler> logger)
+    : IRequestHandler<GetStoreTableContextQuery, StoreTableContextDto?>
+{
+    /// <inheritdoc />
+    public async Task<StoreTableContextDto?> Handle(GetStoreTableContextQuery request, CancellationToken cancellationToken)
+    {
+        // 1. 查询桌码
+        var tenantId = tenantProvider.GetCurrentTenantId();
+        var table = await storeRepository.FindTableByCodeAsync(request.TableCode, tenantId, cancellationToken);
+        if (table is null)
+        {
+            logger.LogWarning("未找到桌码 {TableCode}", request.TableCode);
+            return null;
+        }
+
+        // 2. 查询门店
+        var store = await storeRepository.FindByIdAsync(table.StoreId, tenantId, cancellationToken);
+        if (store is null)
+        {
+            throw new BusinessException(ErrorCodes.NotFound, "门店不存在");
+        }
+
+        // 3. 组装上下文
+        return new StoreTableContextDto
+        {
+            StoreId = store.Id,
+            StoreName = store.Name,
+            Announcement = store.Announcement,
+            Tags = store.Tags,
+            TableId = table.Id,
+            TableCode = table.TableCode,
+            AreaId = table.AreaId,
+            Capacity = table.Capacity,
+            TableTags = table.Tags,
+            Status = table.Status
+        };
+    }
+}