feat(youtube): add feed, history, watch-later, subscriptions, playlist, like, unlike, subscribe, unsubscribe

[sunbird89629]

Description

Add 9 new YouTube commands covering personalized feeds, history, playlists, and write operations.

Related issue:

Type of Change

• ✨ New feature

New Commands

Command	Description	Data Source
youtube feed	Homepage recommended videos	ytInitialData on youtube.com
youtube history	Watch history	DOM scraping on /feed/history
youtube watch-later	Watch Later queue	ytInitialData on /playlist?list=WL
youtube subscriptions	Subscribed channels list	ytInitialData on /feed/channels
youtube playlist	Playlist video list	InnerTube browse API (VL prefix)
youtube like	Like a video	POST /youtubei/v1/like/like
youtube unlike	Remove like from a video	POST /youtubei/v1/like/removelike
youtube subscribe	Subscribe to a channel	POST /youtubei/v1/subscription/subscribe
youtube unsubscribe	Unsubscribe from a channel	POST /youtubei/v1/subscription/unsubscribe

Write commands use SAPISIDHASH auth computed via crypto.subtle.digest('SHA-1', ...) inside page.evaluate(). @handle inputs are auto-resolved to channel IDs via the InnerTube resolve_url endpoint.

Shared helpers extracted to utils.js: FETCH_BROWSE_FN, extractPlaylistVideos, RESOLVE_CHANNEL_HANDLE_FN.

Checklist

• I ran the checks relevant to this PR
• I updated tests or docs if needed
• I included output or screenshots when useful

Documentation

• Updated docs/adapters/browser/youtube.md
• Updated docs/adapters/index.md table
• Updated README.zh-CN.md
• Used positional args for the command's primary subject
• Normalized expected adapter failures to CliError subclasses instead of raw Error

Screenshots / Output

$ node dist/src/main.js youtube feed --limit 3
- channel: 王志安
  duration: '41:26'
  rank: 1
  title: 乌有之乡，乡关何处？
  url: https://www.youtube.com/watch?v=J9a9j0LaDrs
  views: 53万次观看

$ node dist/src/main.js youtube subscriptions --limit 3
- rank: 1
  handle: '@TheValley101'
  name: 硅谷101
  subscribers: 41.3万位订阅者
  url: https://www.youtube.com/@TheValley101

$ node dist/src/main.js youtube like "https://www.youtube.com/watch?v=BOUlHcu2zrE"
- status: success
  message: 'Liked: BOUlHcu2zrE'

$ node dist/src/main.js youtube subscribe "@WebDevSimplified"
- status: success
  message: 'Subscribed to: UCFbNIlppjAuEX4znoulh0Cw'