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/components/ResultDrawer.vue

@@ -28,6 +28,7 @@
         <div class="result-section" v-if="currentQuestion.referenceAnswer">
           <div class="section-title">参考答案</div>
           <div class="reference-text">{{ currentQuestion.referenceAnswer }}</div>
+          <img v-if="currentQuestion.referenceAnswerImage" class="ref-image" :src="'data:image/png;base64,' + currentQuestion.referenceAnswerImage" />
         </div>
 
         <div class="result-score">
@@ -143,6 +144,7 @@ async function gradeAt(idx: number) {
       rubric: q.rubric || `请根据答案内容评分，满分${q.maxScore}分`,
       maxScore: q.maxScore,
       referenceAnswer: q.referenceAnswer,
+      referenceAnswerImage: q.referenceAnswerImage,
       questionTitle: q.questionTitle,
       apiConfig: {
         apiKey: settingsStore.settings.apiKey,
@@ -353,6 +355,13 @@ async function confirmScore() {
   border-radius: 6px;
   white-space: pre-wrap;
 }
+.ref-image {
+  max-width: 100%;
+  max-height: 300px;
+  border-radius: 6px;
+  margin-top: 8px;
+  border: 1px solid #e4e7ed;
+}
 .error-message {
   background: #fef0f0;
   color: #f56c6c;