feat: 重构学员目标系统，支持评估日期/状态自动计算/评估目标，同时恢复方案列表的典型设置

app/models.py

@@ -235,25 +235,43 @@ class StudentGoal(db.Model):
     id = db.Column(db.Integer, primary_key=True)
     student_id = db.Column(db.Integer, db.ForeignKey("students.id"), nullable=False)
     goal_id = db.Column(db.Integer, db.ForeignKey("goals.id"), nullable=False)
-    status = db.Column(db.String(20), default="未开始")  # 未开始/进行中/已完成
-    mastery_level = db.Column(db.Integer, default=1)  # 1-5
-    deadline = db.Column(db.DateTime)
-    completed_at = db.Column(db.DateTime)
+    start_date = db.Column(db.DateTime)  # 开始日期
+    assessment_date = db.Column(db.DateTime)  # 评估日期
+    mastery_level = db.Column(db.Integer, nullable=True)  # 掌握程度 1-5（评估时填写）
+    achievement_date = db.Column(db.DateTime, nullable=True)  # 达成日期
+    comment = db.Column(db.Text, nullable=True)  # 评语
     created_at = db.Column(db.DateTime, default=datetime.now)
 
     student = db.relationship("Student", backref="goal_records")
     goal = db.relationship("Goal")
 
+    def get_status(self):
+        """根据日期自动计算状态"""
+        from datetime import datetime
+        now = datetime.now()
+        if self.start_date and now < self.start_date:
+            return "未开始"
+        elif self.assessment_date and now > self.assessment_date:
+            return "已结束"
+        else:
+            return "进行中"
+
     def to_dict(self):
+        status = self.get_status()
         return {
             "id": self.id,
             "student_id": self.student_id,
             "goal_id": self.goal_id,
             "goal_name": self.goal.name if self.goal else None,
-            "status": self.status,
+            "goal_level": self.goal.level if self.goal else None,
+            "goal_category": self.goal.category if self.goal else None,
+            "status": status,
+            "start_date": self.start_date.isoformat() if self.start_date else None,
+            "assessment_date": self.assessment_date.isoformat() if self.assessment_date else None,
             "mastery_level": self.mastery_level,
-            "deadline": self.deadline.isoformat() if self.deadline else None,
-            "completed_at": self.completed_at.isoformat() if self.completed_at else None,
+            "achievement_date": self.achievement_date.isoformat() if self.achievement_date else None,
+            "comment": self.comment,
+            "created_at": self.created_at.isoformat() if self.created_at else None,
         }