考试明细单行展示，选中科目后增加 AI 解读与建议。

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

backend/app/schemas/__init__.py

@@ -228,6 +228,14 @@ class ExamReviewUpdate(BaseModel):
     reviews: list[ReviewScoreInput] = []
 
 
+class ReviewInsightRequest(BaseModel):
+    subject_name: str = Field(..., min_length=1, max_length=32)
+
+
+class ReviewInsightResponse(BaseModel):
+    insight: str
+
+
 class ExamOut(BaseModel):
     id: UUID
     exam_type: ExamTypeEnum