feat：商户管理

src/Infrastructure/TakeoutSaaS.Infrastructure/App/Repositories/EfStoreRepository.cs

@@ -25,6 +25,16 @@ public sealed class EfStoreRepository(TakeoutAppDbContext context) : IStoreRepos
             .FirstOrDefaultAsync(cancellationToken);
     }
 
+    /// <inheritdoc />
+    public async Task<IReadOnlyList<Store>> GetByMerchantIdAsync(long merchantId, long tenantId, CancellationToken cancellationToken = default)
+    {
+        return await context.Stores
+            .AsNoTracking()
+            .Where(x => x.TenantId == tenantId && x.MerchantId == merchantId)
+            .OrderBy(x => x.Name)
+            .ToListAsync(cancellationToken);
+    }
+
     /// <inheritdoc />
     public async Task<IReadOnlyList<Store>> SearchAsync(long tenantId, StoreStatus? status, CancellationToken cancellationToken = default)
     {
@@ -44,6 +54,31 @@ public sealed class EfStoreRepository(TakeoutAppDbContext context) : IStoreRepos
         return stores;
     }
 
+    /// <inheritdoc />
+    public async Task<Dictionary<long, int>> GetStoreCountsAsync(long? tenantId, IReadOnlyCollection<long> merchantIds, CancellationToken cancellationToken = default)
+    {
+        if (merchantIds.Count == 0)
+        {
+            return new Dictionary<long, int>();
+        }
+
+        var query = context.Stores.AsNoTracking();
+        if (!tenantId.HasValue || tenantId.Value <= 0)
+        {
+            query = query.IgnoreQueryFilters();
+        }
+        else
+        {
+            query = query.Where(x => x.TenantId == tenantId.Value);
+        }
+
+        return await query
+            .Where(x => merchantIds.Contains(x.MerchantId))
+            .GroupBy(x => x.MerchantId)
+            .Select(group => new { group.Key, Count = group.Count() })
+            .ToDictionaryAsync(x => x.Key, x => x.Count, cancellationToken);
+    }
+
     /// <inheritdoc />
     public async Task<IReadOnlyList<StoreBusinessHour>> GetBusinessHoursAsync(long storeId, long tenantId, CancellationToken cancellationToken = default)
     {