修复复盘保存失败：原地更新成绩并新增 review 专用接口。

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/schemas/__init__.py

@@ -219,6 +219,15 @@ class ExamUpdate(BaseModel):
     scores: list[ScoreInput] | None = None
 
 
+class ReviewScoreInput(BaseModel):
+    subject_id: int
+    review_statuses: list[ReviewStatusEnum] = []
+
+
+class ExamReviewUpdate(BaseModel):
+    reviews: list[ReviewScoreInput] = []
+
+
 class ExamOut(BaseModel):
     id: UUID
     exam_type: ExamTypeEnum