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

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+using Jiaowu.Api.Domain.Common;
+
+namespace Jiaowu.Api.Domain.Academic;
+
+public sealed class Campus : CatalogEntity
+{
+    public string? Address { get; set; }
+}
+
+public sealed class College : CatalogEntity
+{
+    public Guid? CampusId { get; set; }
+    public Campus? Campus { get; set; }
+    public string? ShortName { get; set; }
+}
+
+public sealed class Major : CatalogEntity
+{
+    public Guid CollegeId { get; set; }
+    public College? College { get; set; }
+    public required string DegreeType { get; set; }
+    public int SchoolingYears { get; set; } = 4;
+}
+
+public sealed class AdministrativeClass : CatalogEntity
+{
+    public Guid MajorId { get; set; }
+    public Major? Major { get; set; }
+    public int Grade { get; set; }
+    public string? CounselorName { get; set; }
+}
+
+public sealed class Building : CatalogEntity
+{
+    public Guid CampusId { get; set; }
+    public Campus? Campus { get; set; }
+}
+
+public sealed class Classroom : CatalogEntity
+{
+    public Guid BuildingId { get; set; }
+    public Building? Building { get; set; }
+    public int Capacity { get; set; }
+    public string RoomType { get; set; } = "普通教室";
+    public string? Equipment { get; set; }
+}
+
+public sealed class AcademicTerm : CatalogEntity
+{
+    public required string AcademicYear { get; set; }
+    public TermSeason Season { get; set; }
+    public DateOnly StartDate { get; set; }
+    public DateOnly EndDate { get; set; }
+    public bool IsCurrent { get; set; }
+}
+
+public enum TermSeason
+{
+    Autumn = 1,
+    Spring = 2,
+    Summer = 3
+}

src/Jiaowu.Api/Domain/Common/EntityBase.cs

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+namespace Jiaowu.Api.Domain.Common;
+
+public abstract class EntityBase
+{
+    public Guid Id { get; set; } = Guid.NewGuid();
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
+}
+
+public abstract class CatalogEntity : EntityBase
+{
+    public required string Code { get; set; }
+    public required string Name { get; set; }
+    public int SortOrder { get; set; }
+    public bool IsEnabled { get; set; } = true;
+}

src/Jiaowu.Api/Domain/Identity/ApplicationUser.cs

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+using Microsoft.AspNetCore.Identity;
+
+namespace Jiaowu.Api.Domain.Identity;
+
+public sealed class ApplicationUser : IdentityUser<Guid>
+{
+    public required string DisplayName { get; set; }
+    public string? StaffNumber { get; set; }
+    public Guid? CollegeId { get; set; }
+    public bool IsEnabled { get; set; } = true;
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+    public DateTime? LastLoginAt { get; set; }
+}
+
+public sealed class ApplicationRole : IdentityRole<Guid>
+{
+    public string? Description { get; set; }
+    public DataScope DataScope { get; set; } = DataScope.Self;
+}
+
+public enum DataScope
+{
+    Self = 0,
+    Class = 1,
+    College = 2,
+    All = 3
+}
+
+public static class SystemRoles
+{
+    public const string SuperAdmin = "SuperAdmin";
+    public const string AcademicAdmin = "AcademicAdmin";
+    public const string CollegeAdmin = "CollegeAdmin";
+    public const string Teacher = "Teacher";
+    public const string Counselor = "Counselor";
+    public const string Student = "Student";
+    public const string Leader = "Leader";
+
+    public static readonly string[] All =
+    [
+        SuperAdmin,
+        AcademicAdmin,
+        CollegeAdmin,
+        Teacher,
+        Counselor,
+        Student,
+        Leader
+    ];
+}

src/Jiaowu.Api/Domain/System/AuditLog.cs

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+using Jiaowu.Api.Domain.Common;
+
+namespace Jiaowu.Api.Domain.System;
+
+public sealed class AuditLog : EntityBase
+{
+    public Guid? UserId { get; set; }
+    public string? UserName { get; set; }
+    public required string Method { get; set; }
+    public required string Path { get; set; }
+    public int StatusCode { get; set; }
+    public string? IpAddress { get; set; }
+}