feat: 实现租户管理及套餐流程

src/Application/TakeoutSaaS.Application/App/Tenants/Commands/ChangeTenantSubscriptionPlanCommand.cs

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+using MediatR;
+using System.ComponentModel.DataAnnotations;
+using TakeoutSaaS.Application.App.Tenants.Dto;
+
+namespace TakeoutSaaS.Application.App.Tenants.Commands;
+
+/// <summary>
+/// 套餐升降配命令。
+/// </summary>
+public sealed record ChangeTenantSubscriptionPlanCommand(
+    [property: Required] long TenantId,
+    [property: Required] long TenantSubscriptionId,
+    [property: Required] long TargetPackageId,
+    bool Immediate,
+    string? Notes) : IRequest<TenantSubscriptionDto>;

src/Application/TakeoutSaaS.Application/App/Tenants/Commands/CreateTenantSubscriptionCommand.cs

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+using MediatR;
+using System.ComponentModel.DataAnnotations;
+using TakeoutSaaS.Application.App.Tenants.Dto;
+
+namespace TakeoutSaaS.Application.App.Tenants.Commands;
+
+/// <summary>
+/// 新建或续费订阅。
+/// </summary>
+public sealed record CreateTenantSubscriptionCommand(
+    [property: Required] long TenantId,
+    [property: Required] long TenantPackageId,
+    int DurationMonths,
+    bool AutoRenew,
+    string? Notes) : IRequest<TenantSubscriptionDto>;

src/Application/TakeoutSaaS.Application/App/Tenants/Commands/RegisterTenantCommand.cs

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+using MediatR;
+using System.ComponentModel.DataAnnotations;
+using TakeoutSaaS.Application.App.Tenants.Dto;
+
+namespace TakeoutSaaS.Application.App.Tenants.Commands;
+
+/// <summary>
+/// 注册租户命令。
+/// </summary>
+public sealed record RegisterTenantCommand(
+    [property: Required, StringLength(64)] string Code,
+    [property: Required, StringLength(128)] string Name,
+    string? ShortName,
+    string? Industry,
+    string? ContactName,
+    string? ContactPhone,
+    string? ContactEmail,
+    [property: Required] long TenantPackageId,
+    int DurationMonths = 12,
+    bool AutoRenew = true,
+    DateTime? EffectiveFrom = null) : IRequest<TenantDto>;

src/Application/TakeoutSaaS.Application/App/Tenants/Commands/ReviewTenantCommand.cs

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+using MediatR;
+using System.ComponentModel.DataAnnotations;
+using TakeoutSaaS.Application.App.Tenants.Dto;
+
+namespace TakeoutSaaS.Application.App.Tenants.Commands;
+
+/// <summary>
+/// 审核租户命令。
+/// </summary>
+public sealed record ReviewTenantCommand(
+    [property: Required] long TenantId,
+    bool Approve,
+    string? Reason) : IRequest<TenantDto>;

src/Application/TakeoutSaaS.Application/App/Tenants/Commands/SubmitTenantVerificationCommand.cs

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+using MediatR;
+using System.ComponentModel.DataAnnotations;
+using TakeoutSaaS.Application.App.Tenants.Dto;
+
+namespace TakeoutSaaS.Application.App.Tenants.Commands;
+
+/// <summary>
+/// 提交租户实名认证资料。
+/// </summary>
+public sealed record SubmitTenantVerificationCommand(
+    [property: Required] long TenantId,
+    string? BusinessLicenseNumber,
+    string? BusinessLicenseUrl,
+    string? LegalPersonName,
+    string? LegalPersonIdNumber,
+    string? LegalPersonIdFrontUrl,
+    string? LegalPersonIdBackUrl,
+    string? BankAccountName,
+    string? BankAccountNumber,
+    string? BankName,
+    string? AdditionalDataJson) : IRequest<TenantVerificationDto>;