feat(route): 增加少数派首页路由每篇文章的封面图片 (DIYgod#15716)

* Update index.ts

* Update index.ts

* sspai index image

lib/routes/sspai/index.ts

@@ -41,7 +41,15 @@ async function handler() {
             const key = `sspai: ${item.id}`;
             return cache.tryGet(key, async () => {
                 const response = await got({ method: 'get', url: link });
-                description = response.data.data.body;
+                const articleData = response.data.data;
+                let banner = articleData.banner;
+                if (articleData.keywords.includes('派早报')) {
+                    banner = `https://cdnfile.sspai.com/${banner}`;
+                }
+                if (banner) {
+                    description = `<img src="${banner}" alt="Article Cover Image" style="display: block; margin: 0 auto;"><br>`;
+                }
+                description += articleData.body;
 
                 return {
                     title: item.title.trim(),