fix(答案处理): 改进多答案字符串的分割逻辑

处理类似"同创造,共分享,齐飞扬"格式的答案字符串，统一使用逗号分割并去除空格

api/controllers/quizController.ts

@@ -116,9 +116,16 @@ export class QuizController {
             userAnsList = answer.userAnswer;
           } else if (typeof answer.userAnswer === 'string') {
             try {
-              userAnsList = JSON.parse(answer.userAnswer);
+              const parsed = JSON.parse(answer.userAnswer);
+              if (Array.isArray(parsed)) {
+                userAnsList = parsed;
+              } else {
+                // 尝试按逗号分割（处理如"同创造,共分享,齐飞扬"格式）
+                userAnsList = answer.userAnswer.split(',').map(item => item.trim());
+              }
             } catch (e) {
-              userAnsList = [answer.userAnswer];
+              // JSON解析失败，尝试按逗号分割
+              userAnsList = answer.userAnswer.split(',').map(item => item.trim());
             }
           }
 
@@ -128,10 +135,15 @@ export class QuizController {
           } else if (typeof question.answer === 'string') {
             try {
               const parsed = JSON.parse(question.answer);
-              if (Array.isArray(parsed)) correctAnsList = parsed;
-              else correctAnsList = [question.answer];
+              if (Array.isArray(parsed)) {
+                correctAnsList = parsed;
+              } else {
+                // 尝试按逗号分割（处理如"同创造,共分享,齐飞扬"格式）
+                correctAnsList = question.answer.split(',').map(item => item.trim());
+              }
             } catch {
-              correctAnsList = [question.answer];
+              // JSON解析失败，尝试按逗号分割
+              correctAnsList = question.answer.split(',').map(item => item.trim());
             }
           }