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/Application/TakeoutSaaS.Application/App/QuotaPackages/Queries/GetTenantQuotaUsageQuery.cs

@@ -0,0 +1,21 @@
+using MediatR;
+using TakeoutSaaS.Application.App.QuotaPackages.Dto;
+using TakeoutSaaS.Domain.Tenants.Enums;
+
+namespace TakeoutSaaS.Application.App.QuotaPackages.Queries;
+
+/// <summary>
+/// 获取租户配额使用情况查询。
+/// </summary>
+public sealed record GetTenantQuotaUsageQuery : IRequest<IReadOnlyList<TenantQuotaUsageDto>>
+{
+    /// <summary>
+    /// 租户 ID。
+    /// </summary>
+    public long TenantId { get; init; }
+
+    /// <summary>
+    /// 配额类型（可选筛选）。
+    /// </summary>
+    public TenantQuotaType? QuotaType { get; init; }
+}