新增文本题库导入功能，题目新增“解析”字段

src/pages/QuizPage.tsx

@@ -14,6 +14,7 @@ interface Question {
   type: 'single' | 'multiple' | 'judgment' | 'text';
   options?: string[];
   answer: string | string[];
+  analysis?: string;
   score: number;
   createdAt: string;
   category?: string;
@@ -38,6 +39,7 @@ const QuizPage = () => {
   const [timeLimit, setTimeLimit] = useState<number | null>(null);
   const [subjectId, setSubjectId] = useState<string>('');
   const [taskId, setTaskId] = useState<string>('');
+  const [showAnalysis, setShowAnalysis] = useState(false);
 
   useEffect(() => {
     if (!user) {
@@ -83,6 +85,10 @@ const QuizPage = () => {
     return () => clearInterval(timer);
   }, [timeLeft]);
 
+  useEffect(() => {
+    setShowAnalysis(false);
+  }, [currentQuestionIndex]);
+
   const generateQuiz = async () => {
     try {
       setLoading(true);
@@ -335,6 +341,23 @@ const QuizPage = () => {
             {renderQuestion(currentQuestion)}
           </div>
 
+          {String(currentQuestion.analysis ?? '').trim() ? (
+            <div className="mb-6">
+              <Button
+                type="link"
+                onClick={() => setShowAnalysis((v) => !v)}
+                className="p-0 h-auto text-mars-600 hover:text-mars-700"
+              >
+                {showAnalysis ? '收起解析' : '查看解析'}
+              </Button>
+              {showAnalysis ? (
+                <div className="mt-2 p-4 rounded-lg border border-gray-100 bg-gray-50 text-gray-700 whitespace-pre-wrap">
+                  {currentQuestion.analysis}
+                </div>
+              ) : null}
+            </div>
+          ) : null}
+
           {/* 操作按钮 */}
           <div className="flex justify-between items-center pt-6 border-t border-gray-100">
             <Button