Add remote-components flag to subscription functions

Fixed two subscription-related functions that were missing the
--remote-components ejs:github flag:
- getSubscriptionInfo: Gets initial subscription info
- generateArgsForSubscription: Generates args for subscription downloads

This ensures YouTube subscriptions work properly with Deno.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

backend/subscriptions.js

@@ -52,6 +52,8 @@ exports.subscribe = async (sub, user_uid = null, skip_get_info = false) => {
 }
 
 async function getSubscriptionInfo(sub) {
+    const default_downloader = config_api.getConfigItem('ytdl_default_downloader');
+
     // get videos
     let downloadConfig = ['--dump-json', '--playlist-end', '1'];
     let useCookies = config_api.getConfigItem('ytdl_use_cookies');
@@ -63,6 +65,11 @@ async function getSubscriptionInfo(sub) {
         }
     }
 
+    // Enable external JavaScript support for YouTube (requires Deno + yt-dlp-ejs)
+    if (default_downloader === 'yt-dlp') {
+        downloadConfig.push('--remote-components', 'ejs:github');
+    }
+
     let {callback} = await youtubedl_api.runYoutubeDL(sub.url, downloadConfig);
     const {parsed_output, err} = await callback;
     if (err) {
@@ -435,6 +442,8 @@ async function generateArgsForSubscription(sub, user_uid, redownload = false, de
     const default_downloader = config_api.getConfigItem('ytdl_default_downloader');
     if (default_downloader === 'yt-dlp') {
         downloadConfig.push('--no-clean-info-json');
+        // Enable external JavaScript support for YouTube (requires Deno + yt-dlp-ejs)
+        downloadConfig.push('--remote-components', 'ejs:github');
     }
 
     downloadConfig = utils.filterArgs(downloadConfig, ['--write-comments']);