缴费系统

src/Jiaowu.Api/Domain/Academic/CampusRegistrationEntities.cs

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+using Jiaowu.Api.Domain.Common;
+using Jiaowu.Api.Domain.Identity;
+
+namespace Jiaowu.Api.Domain.Academic;
+
+public sealed class CampusRegistrationProject : EntityBase
+{
+    public required string Code { get; set; }
+    public required string Name { get; set; }
+    public string? Description { get; set; }
+    public Guid? CollegeId { get; set; }
+    public College? College { get; set; }
+    public DateTime RegistrationStartsAt { get; set; }
+    public DateTime RegistrationEndsAt { get; set; }
+    public int Capacity { get; set; }
+    public decimal FeeAmount { get; set; }
+    public bool RequiresReview { get; set; }
+    public CampusRegistrationProjectStatus Status { get; set; } = CampusRegistrationProjectStatus.Draft;
+    public string? ContactName { get; set; }
+    public string? ContactPhone { get; set; }
+    public string? Notes { get; set; }
+    public Guid CreatedByUserId { get; set; }
+    public ApplicationUser? CreatedByUser { get; set; }
+    public ICollection<CampusRegistrationApplication> Applications { get; set; } = [];
+}
+
+public sealed class CampusRegistrationApplication : EntityBase
+{
+    public Guid ProjectId { get; set; }
+    public CampusRegistrationProject? Project { get; set; }
+    public Guid StudentId { get; set; }
+    public Student? Student { get; set; }
+    public CampusRegistrationApplicationStatus Status { get; set; }
+    public string? ApplicantNote { get; set; }
+    public Guid? ReviewedByUserId { get; set; }
+    public ApplicationUser? ReviewedByUser { get; set; }
+    public DateTime? ReviewedAt { get; set; }
+    public string? ReviewComment { get; set; }
+    public DateTime? ConfirmedAt { get; set; }
+    public DateTime? CancelledAt { get; set; }
+    public CampusPaymentOrder? PaymentOrder { get; set; }
+}
+
+public sealed class CampusPaymentOrder : EntityBase
+{
+    public Guid ApplicationId { get; set; }
+    public CampusRegistrationApplication? Application { get; set; }
+    public required string OrderNumber { get; set; }
+    public decimal Amount { get; set; }
+    public CampusPaymentMethod PaymentMethod { get; set; }
+    public CampusPaymentOrderStatus Status { get; set; } = CampusPaymentOrderStatus.Pending;
+    public Guid? ConfirmedByUserId { get; set; }
+    public ApplicationUser? ConfirmedByUser { get; set; }
+    public DateTime? ConfirmedAt { get; set; }
+    public string? ReferenceNumber { get; set; }
+    public string? Note { get; set; }
+}
+
+public sealed class CampusWalletAccount : EntityBase
+{
+    public Guid StudentId { get; set; }
+    public Student? Student { get; set; }
+    public decimal Balance { get; set; }
+    public ICollection<CampusWalletTransaction> Transactions { get; set; } = [];
+}
+
+public sealed class CampusWalletTransaction : EntityBase
+{
+    public Guid WalletAccountId { get; set; }
+    public CampusWalletAccount? WalletAccount { get; set; }
+    public decimal Amount { get; set; }
+    public decimal BalanceAfter { get; set; }
+    public CampusWalletTransactionType Type { get; set; }
+    public required string Reason { get; set; }
+    public Guid? PaymentOrderId { get; set; }
+    public CampusPaymentOrder? PaymentOrder { get; set; }
+    public Guid? OperatedByUserId { get; set; }
+    public ApplicationUser? OperatedByUser { get; set; }
+}
+
+public enum CampusRegistrationProjectStatus { Draft = 1, Published = 2, Closed = 3 }
+public enum CampusRegistrationApplicationStatus { PendingReview = 1, PendingPayment = 2, Confirmed = 3, Waitlisted = 4, Rejected = 5, Cancelled = 6 }
+public enum CampusPaymentMethod { Free = 1, Offline = 2, Balance = 3 }
+public enum CampusPaymentOrderStatus { Pending = 1, Paid = 2, Cancelled = 3 }
+public enum CampusWalletTransactionType { AdministratorAdjustment = 1, Payment = 2 }

src/Jiaowu.Api/Domain/Academic/TuitionEntities.cs

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+using Jiaowu.Api.Domain.Common;
+
+namespace Jiaowu.Api.Domain.Academic;
+
+public sealed class TuitionTermSetting : EntityBase
+{
+    public Guid AcademicTermId { get; set; }
+    public AcademicTerm? AcademicTerm { get; set; }
+    public decimal CreditUnitPrice { get; set; }
+    public TuitionTermStatus Status { get; set; } = TuitionTermStatus.Draft;
+    public DateTime? CreditsLockedAt { get; set; }
+    public Guid? CreditsLockedByUserId { get; set; }
+}
+
+public sealed class TuitionBill : EntityBase
+{
+    public Guid AcademicTermId { get; set; }
+    public AcademicTerm? AcademicTerm { get; set; }
+    public Guid StudentId { get; set; }
+    public Student? Student { get; set; }
+    public decimal BaseTuition { get; set; }
+    public decimal AccommodationFee { get; set; }
+    public decimal CreditCount { get; set; }
+    public decimal CreditFee { get; set; }
+    public decimal ReconciliationAdjustment { get; set; }
+    public decimal BasePaid { get; set; }
+    public decimal AccommodationPaid { get; set; }
+    public decimal CreditPaid { get; set; }
+    public decimal AdjustmentPaid { get; set; }
+    public ICollection<TuitionPayment> Payments { get; set; } = [];
+}
+
+public sealed class TuitionPayment : EntityBase
+{
+    public Guid TuitionBillId { get; set; }
+    public TuitionBill? TuitionBill { get; set; }
+    public TuitionFeeItem Item { get; set; }
+    public decimal Amount { get; set; }
+    public TuitionPaymentMethod Method { get; set; }
+    public string? ReferenceNumber { get; set; }
+    public Guid ConfirmedByUserId { get; set; }
+    public DateTime ConfirmedAt { get; set; }
+}
+
+public enum TuitionTermStatus { Draft = 1, CreditsLocked = 2, OpenForPayment = 3, Reconciliation = 4, Closed = 5 }
+public enum TuitionFeeItem { BaseTuition = 1, CreditFee = 2, AccommodationFee = 3, ReconciliationAdjustment = 4 }
+public enum TuitionPaymentMethod { Offline = 1, Balance = 2 }