feat: 参考答案图片上传 + AI提示词分有无标准答案图片两种流程

src/types/index.ts

@@ -3,6 +3,7 @@ export interface QuestionItem {
   maxScore: number
   referenceAnswer: string
   rubric: string
+  referenceAnswerImage?: string
 }
 
 export interface GradeResult {
@@ -56,7 +57,7 @@ export interface ElectronAPI {
     onCompleted: (callback: (base64: string) => void) => () => void
   }
   ai: {
-    grade: (data: { imageBase64: string; rubric: string; apiConfig: ApiConfig; maxScore?: number; referenceAnswer?: string; questionTitle?: string }) => Promise<GradeResult>
+    grade: (data: { imageBase64: string; rubric: string; apiConfig: ApiConfig; maxScore?: number; referenceAnswer?: string; questionTitle?: string; referenceAnswerImage?: string }) => Promise<GradeResult>
   }
   settings: {
     get: () => Promise<AppSettings>