feat(route/cna): support headlines (#21053)

* feat(route/cna): declare headlines as supported

https://www.cna.com.tw/list/headlines.aspx works the same as other
categories (aall, aipl, ...) - the same HTML structure and API

* fix(route/cna): ignore youtube links during full-text extraction

Sometimes a youtube link instead of a news page is used directly as a
news item (ex: 晚間影音新聞 during 6~7pm UTC+8 on weekdays). That
may result in HTTP 429. Full-text extraction returns nothing, anyway.

* fix(route/cna): note about where the API is from

Author: yan12125

lib/routes/cna/index.ts

@@ -22,16 +22,17 @@ export const route: Route = {
     name: '分类',
     maintainers: ['nczitzk'],
     handler,
-    description: `| 即時 | 政治 | 國際 | 兩岸 | 產經 | 證券 | 科技 | 生活 | 社會 | 地方 | 文化 | 運動 | 娛樂 |
-| ---- | ---- | ---- | ---- | ---- | ---- | ---- | ---- | ---- | ---- | ---- | ---- | ---- |
-| aall | aipl | aopl | acn  | aie  | asc  | ait  | ahel | asoc | aloc | acul | aspt | amov |`,
+    description: `| 聚焦      | 即時 | 政治 | 國際 | 兩岸 | 產經 | 證券 | 科技 | 生活 | 社會 | 地方 | 文化 | 運動 | 娛樂 |
+| --------- | ---- | ---- | ---- | ---- | ---- | ---- | ---- | ---- | ---- | ---- | ---- | ---- | ---- |
+| headlines | aall | aipl | aopl | acn  | aie  | asc  | ait  | ahel | asoc | aloc | acul | aspt | amov |`,
 };
 
 async function handler(ctx) {
     const id = ctx.req.param('id') || 'aall';
     const isTopic = /^\d+$/.test(id);
     const limit = ctx.req.query('limit') ? Number.parseInt(ctx.req.query('limit'), 10) : 20;
 
+    // The API used by the website when hitting "看更多內容"
     const { data: response } = await got({
         method: 'post',
         url: `https://www.cna.com.tw/cna2018api/api/${isTopic ? 'WTopic' : 'WNewsList'}`,

lib/routes/cna/utils.ts

@@ -3,6 +3,10 @@ import { load } from 'cheerio';
 import got from '@/utils/got';
 
 export async function getFullText(item) {
+    if (item.link.startsWith('https://www.youtube.com/')) {
+        return item;
+    }
+
     const detailResponse = await got({
         method: 'get',
         url: item.link,