fix(api): 修正接口路径并优化定时任务逻辑

- 将上传考试单词图片接口路径由 /exam/words/genexam 修改为 /exam/words/submit
- AutoJudgeExamWordsTask 中注入 ExamWordsJudgeService 服务
- 定时任务中调用 examWordsJudgeService.judgeExamWords 方法实现自动判卷
- 注释掉 PngUtil 中调试用的图像保存代码，避免生成多余文件

enlish-service/src/main/java/com/yinlihupo/enlish/service/job/AutoJudgeExamWordsTask.java

@@ -1,5 +1,7 @@
 package com.yinlihupo.enlish.service.job;
 
+import com.yinlihupo.enlish.service.service.ExamWordsJudgeService;
+import jakarta.annotation.Resource;
 import org.springframework.scheduling.annotation.Scheduled;
 import org.springframework.stereotype.Component;
 
@@ -8,8 +10,12 @@ import java.time.LocalDateTime;
 @Component
 public class AutoJudgeExamWordsTask {
 
+    @Resource
+    private ExamWordsJudgeService examWordsJudgeService;
+
     @Scheduled(fixedRate = 5000)
     public void autoJudgeExamWords() {
         System.out.println("【固定频率】开始自动判卷，时间：" + LocalDateTime.now());
+        examWordsJudgeService.judgeExamWords(5);
     }
 }

enlish-service/src/main/java/com/yinlihupo/enlish/service/utils/PngUtil.java

@@ -219,7 +219,7 @@ public class PngUtil {
         Imgproc.threshold(gray, binary, 0, 255, Imgproc.THRESH_BINARY | Imgproc.THRESH_OTSU);
 
         // 可选：保存预处理后的图片查看效果
-        Imgcodecs.imwrite("debug_roi.jpg", binary);
+//        Imgcodecs.imwrite("debug_roi.jpg", binary);
 
         // 4. 将 OpenCV Mat 转换为 BufferedImage (供 Tess4J 使用)
         BufferedImage processedImage = matToBufferedImage(binary);