教学评价闭环：

新增同行/督导评价、教师改进计划、教师完成申报、管理员复评与退回机制。
闭环数据按教学班和学期归档；管理端可追踪计划数、已复评数及未闭环事项。
保留原学生评教流程；同行不能评价本人教学班，所有查询与写入均受学院数据范围限制。

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

@@ -82,3 +82,50 @@ public sealed class EvaluationScore
 
     public int Score { get; set; }
 }
+
+/// <summary>同行或督导对教学班的独立评价，和学生匿名评教分开留痕。</summary>
+public sealed class TeachingObservationEvaluation : EntityBase
+{
+    public Guid AcademicTermId { get; set; }
+    public AcademicTerm AcademicTerm { get; set; } = null!;
+    public Guid TeachingTaskId { get; set; }
+    public TeachingTask TeachingTask { get; set; } = null!;
+    public Guid EvaluatorUserId { get; set; }
+    public EvaluationSource Source { get; set; }
+    public int Score { get; set; }
+    public string Strengths { get; set; } = string.Empty;
+    public string Issues { get; set; } = string.Empty;
+    public string Recommendation { get; set; } = string.Empty;
+    public DateTime SubmittedAt { get; set; }
+}
+
+public enum EvaluationSource { Peer = 1, Supervision = 2 }
+
+/// <summary>教师针对评价结论形成的改进计划；复评记录挂在计划下。</summary>
+public sealed class TeachingImprovementPlan : EntityBase
+{
+    public Guid AcademicTermId { get; set; }
+    public AcademicTerm AcademicTerm { get; set; } = null!;
+    public Guid TeachingTaskId { get; set; }
+    public TeachingTask TeachingTask { get; set; } = null!;
+    public Guid TeacherId { get; set; }
+    public Teacher Teacher { get; set; } = null!;
+    public string ProblemSummary { get; set; } = string.Empty;
+    public string Actions { get; set; } = string.Empty;
+    public DateOnly? DueDate { get; set; }
+    public ImprovementPlanStatus Status { get; set; } = ImprovementPlanStatus.Draft;
+    public DateTime? SubmittedAt { get; set; }
+    public ICollection<TeachingImprovementReview> Reviews { get; set; } = new List<TeachingImprovementReview>();
+}
+
+public enum ImprovementPlanStatus { Draft = 0, Submitted = 1, InProgress = 2, Completed = 3, Rework = 4, Reviewed = 5 }
+
+public sealed class TeachingImprovementReview : EntityBase
+{
+    public Guid TeachingImprovementPlanId { get; set; }
+    public TeachingImprovementPlan TeachingImprovementPlan { get; set; } = null!;
+    public Guid ReviewerUserId { get; set; }
+    public bool IsApproved { get; set; }
+    public string Comment { get; set; } = string.Empty;
+    public DateTime ReviewedAt { get; set; }
+}