增加周榜，月榜，日榜搜索和批量下载

backend/routes/ranking.js

@@ -0,0 +1,42 @@
+const express = require('express');
+const ArtworkService = require('../services/artwork');
+const ResponseUtil = require('../utils/response');
+
+const router = express.Router();
+
+/**
+ * 获取排行榜数据
+ * GET /api/ranking
+ * 参数: mode (day/week/month), type (art/manga/novel), offset, limit
+ */
+router.get('/', async (req, res) => {
+  try {
+    const { mode = 'day', type = 'art', offset = 0, limit = 30 } = req.query;
+    
+    // 验证参数
+    if (!['day', 'week', 'month'].includes(mode)) {
+      return res.status(400).json(ResponseUtil.error('无效的时间模式'));
+    }
+    
+    if (!['art', 'manga', 'novel'].includes(type)) {
+      return res.status(400).json(ResponseUtil.error('无效的作品类型'));
+    }
+    
+    // 创建作品服务实例，传入认证信息
+    const artworkService = new ArtworkService(req.backend.auth);
+    
+    const result = await artworkService.getRankingArtworks({
+      mode,
+      content: type,
+      offset: parseInt(offset),
+      limit: parseInt(limit)
+    });
+    
+    res.json(ResponseUtil.success(result));
+  } catch (error) {
+    console.error('获取排行榜失败:', error);
+    res.status(500).json(ResponseUtil.error(error.message));
+  }
+});
+
+module.exports = router;