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/__init__.py

@@ -154,6 +154,25 @@ def create_app():
                     {"new_cat": new_cat, "old_cat": old_cat}
                 )
             db.session.commit()
+
+            # 检查student_goals表是否有新字段
+            result8 = db.session.execute(text("PRAGMA table_info(student_goals)"))
+            sg_columns = [row[1] for row in result8]
+            if "start_date" not in sg_columns:
+                db.session.execute(text("ALTER TABLE student_goals ADD COLUMN start_date TIMESTAMP"))
+                db.session.commit()
+            if "assessment_date" not in sg_columns:
+                db.session.execute(text("ALTER TABLE student_goals ADD COLUMN assessment_date TIMESTAMP"))
+                db.session.commit()
+            if "achievement_date" not in sg_columns:
+                db.session.execute(text("ALTER TABLE student_goals ADD COLUMN achievement_date TIMESTAMP"))
+                db.session.commit()
+            if "comment" not in sg_columns:
+                db.session.execute(text("ALTER TABLE student_goals ADD COLUMN comment TEXT"))
+                db.session.commit()
+            # 删除不再使用的字段
+            # deadline 和 completed_at 已被 start_date, assessment_date, achievement_date 取代
+            # status 字段现在由日期计算，不再存储
         except Exception as e:
             print(f"数据库迁移: {e}")