fix:优化试题内容和样式排版

backend/app/schemas.py

@@ -31,7 +31,10 @@ class MistakeBase(BaseModel):
     image_url: str | None = None
     category: str
     difficulty: str | None = Field(None, pattern="^(easy|medium|hard)$")
-    note: str | None = Field(None, max_length=500)
+    question_content: str | None = Field(None, max_length=8000)
+    answer: str | None = Field(None, max_length=4000)
+    explanation: str | None = Field(None, max_length=8000)
+    note: str | None = Field(None, max_length=4000)
     wrong_count: int = Field(1, ge=1)
 
 
@@ -99,3 +102,18 @@ class AiStudyPlanIn(BaseModel):
 
 class AiStudyPlanOut(BaseModel):
     plan: str
+
+
+class OcrParseIn(BaseModel):
+    image_url: str = Field(..., max_length=1024)
+    prompt: str | None = Field(None, max_length=500)
+
+
+class OcrParseOut(BaseModel):
+    text: str
+    title_suggestion: str | None = None
+    category_suggestion: str | None = None
+    difficulty_suggestion: str | None = None
+    question_content: str | None = None
+    answer: str | None = None
+    explanation: str | None = None