feat: 新增配额包/支付相关实体与迁移

App：新增 operation_logs/quota_packages/tenant_payments/tenant_quota_package_purchases 表

Identity：修正 Avatar 字段类型（varchar(256)->text），保持现有数据不变

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

@@ -20,6 +20,20 @@ public sealed class EfTenantRepository(TakeoutAppDbContext context) : ITenantRep
             .FirstOrDefaultAsync(x => x.Id == tenantId, cancellationToken);
     }
 
+    /// <inheritdoc />
+    public async Task<IReadOnlyList<Tenant>> FindByIdsAsync(IReadOnlyCollection<long> tenantIds, CancellationToken cancellationToken = default)
+    {
+        if (tenantIds.Count == 0)
+        {
+            return Array.Empty<Tenant>();
+        }
+
+        return await context.Tenants
+            .AsNoTracking()
+            .Where(x => tenantIds.Contains(x.Id))
+            .ToListAsync(cancellationToken);
+    }
+
     /// <inheritdoc />
     public async Task<IReadOnlyList<Tenant>> SearchAsync(
         TenantStatus? status,