增加作品完整性检查

backend/routes/download.js

@@ -650,4 +650,41 @@ router.get('/stats', async (req, res) => {
   }
 });
 
+/**
+ * 强制重新检查作品下载状态
+ * POST /api/download/force-check/:artworkId
+ */
+router.post('/force-check/:artworkId', async (req, res) => {
+  try {
+    const { artworkId } = req.params;
+    
+    if (!artworkId || isNaN(parseInt(artworkId))) {
+      return res.status(400).json({
+        success: false,
+        error: 'Invalid artwork ID'
+      });
+    }
+
+    const downloadService = req.backend.getDownloadService();
+    
+    // 强制重新检查，包括清理不完整的文件
+    const result = await downloadService.forceCheckArtworkDownloaded(parseInt(artworkId));
+    
+    res.json({
+      success: true,
+      data: {
+        artwork_id: parseInt(artworkId),
+        is_downloaded: result.is_downloaded,
+        cleaned_files: result.cleaned_files || 0,
+        message: result.message
+      }
+    });
+  } catch (error) {
+    res.status(500).json({
+      success: false,
+      error: error.message
+    });
+  }
+});
+
 module.exports = router;