feat: add postMessage notifications for exam submission and saving

src/views/Exam.vue

@@ -211,6 +211,7 @@ export default {
       this.cacheExamTimer && clearInterval(this.cacheExamTimer)
       await api.endExam(this.examId, params)
       this.$message.success('提交成功')
+      window.parent?.postMessage({ action: 'submitExam', data: { examId: this.examId, answer: this.getAnswer() } }, '*')
     },
     // 保存试卷
     async handleSaveExam() {
@@ -222,6 +223,7 @@ export default {
       }
       await this.postCacheExam()
       this.$message.success('保存成功')
+      window.parent?.postMessage({ action: 'saveExam', data: { examId: this.examId, answer: this.getAnswer() } }, '*')
     },
     // 缓存试卷
     async postCacheExam() {