修复图片下载问题

backend-java/src/main/java/com/nanri/aiimage/modules/pricetrack/service/PriceTrackTaskService.java

@@ -78,7 +78,7 @@ public class PriceTrackTaskService {
     private FileTaskEntity loadTaskForExecution(Long taskId) {
         Map<Long, FileTaskEntity> cachedTasks = priceTrackTaskCacheService.getTaskCacheBatch(List.of(taskId));
         FileTaskEntity cached = cachedTasks.get(taskId);
-        if (cached != null) {
+        if (cached != null && hasText(cached.getRequestJson())) {
             return cached;
         }
         FileTaskEntity dbTask = fileTaskMapper.selectById(taskId);
@@ -396,7 +396,6 @@ public class PriceTrackTaskService {
         task.setCreatedAt(LocalDateTime.now());
         task.setUpdatedAt(LocalDateTime.now());
         fileTaskMapper.insert(task);
-        priceTrackTaskCacheService.saveTaskCache(task);
         priceTrackTaskCacheService.touchTaskHeartbeat(task.getId());
         if (request.getLoopRunId() != null) {
             priceTrackLoopRunService.bindChildTask(request.getLoopRunId(), task.getId(), request.getRoundIndex(), request.getShopIndex());
@@ -447,6 +446,7 @@ public class PriceTrackTaskService {
             throw new BusinessException("序列化任务数据失败");
         }
         fileTaskMapper.updateById(task);
+        priceTrackTaskCacheService.saveTaskCache(task);
 
         // TODO: Python 侧轮询 RUNNING 任务，pickup 后开始处理
         // Java 侧通过 submitResult 接口接收 Python 回传结果
@@ -1548,6 +1548,10 @@ public class PriceTrackTaskService {
         return taskDistributedLockService.acquire(MODULE_TYPE, taskId);
     }
 
+    private static boolean hasText(String value) {
+        return value != null && !value.isBlank();
+    }
+
     private void cleanupTaskCacheIfTerminal(Long taskId, String taskStatus) {
         if (!"SUCCESS".equals(taskStatus) && !"FAILED".equals(taskStatus) && !"DELETE_EMPTY".equals(taskStatus)) {
             return;