first commit

backend/F9WebAiTest.Domain/Entities/Attendance/AttendanceRecord.cs

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+using FreeSql.DataAnnotations;
+using F9WebAiTest.Domain.Common;
+
+namespace F9WebAiTest.Domain.Entities.Attendance;
+
+/// <summary>考勤打卡记录</summary>
+[Table(Name = "AttendanceRecords")]
+[Index("IX_AttendanceRecords_EmployeeId_WorkDate", "EmployeeId, WorkDate", IsUnique = true)]
+public class AttendanceRecord : BaseEntity
+{
+    public long EmployeeId { get; set; }
+    public DateTime WorkDate { get; set; }        // 考勤日期
+    public DateTime? SignInTime { get; set; }     // 签到时间
+    public DateTime? SignOutTime { get; set; }    // 签退时间
+    public string SignInStatus { get; set; } = "";  // 正常/迟到/缺卡
+    public string SignOutStatus { get; set; } = ""; // 正常/早退/缺卡
+    public string Remark { get; set; } = "";
+}

backend/F9WebAiTest.Domain/Entities/Attendance/LeaveApprover.cs

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+using FreeSql.DataAnnotations;
+using F9WebAiTest.Domain.Common;
+
+namespace F9WebAiTest.Domain.Entities.Attendance;
+
+/// <summary>请假审批节点（多级审批流程，OrderNo 表示审批顺序）</summary>
+[Table(Name = "LeaveApprovers")]
+[Index("IX_LeaveApprovers_LeaveId_OrderNo", "LeaveId, OrderNo", IsUnique = true)]
+public class LeaveApprover : BaseEntity
+{
+    public long LeaveId { get; set; }
+    public long ApproverId { get; set; }          // 审批人ID
+    public string ApproverName { get; set; } = ""; // 审批人姓名（冗余）
+    public int OrderNo { get; set; }               // 序号（从1开始，表示审批顺序）
+    public string Status { get; set; } = "待审批"; // 待审批/已批准/已驳回
+    public string ApproveRemark { get; set; } = "";
+    public DateTime? ApprovedAt { get; set; }
+}

backend/F9WebAiTest.Domain/Entities/Attendance/LeaveRequest.cs

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+using FreeSql.DataAnnotations;
+using F9WebAiTest.Domain.Common;
+
+namespace F9WebAiTest.Domain.Entities.Attendance;
+
+/// <summary>请假申请</summary>
+[Table(Name = "LeaveRequests")]
+public class LeaveRequest : BaseEntity
+{
+    public long EmployeeId { get; set; }
+    public string Type { get; set; } = "事假";    // 事假/病假/年假/调休/婚假/产假
+    public DateTime StartTime { get; set; }
+    public DateTime EndTime { get; set; }
+    public string Reason { get; set; } = "";
+    public string Status { get; set; } = "待审批"; // 待审批/已批准/已驳回
+    public int CurrentOrderNo { get; set; } = 1;  // 当前审批到第几步（多级审批）
+    public long? ApproverId { get; set; }
+    public string ApproverName { get; set; } = "";
+    public string ApproveRemark { get; set; } = "";
+    public DateTime? ApprovedAt { get; set; }
+}