v5.0: Cloudflare Worker strategy - permanent free solution

debug: Add download diagnostic endpoint and enhanced health check

fix: Remove yt-dlp from info fetch, reduce timeouts, oEmbed returns fast

v4.0: Radical API-First Strategy - Cobalt → Piped → Invidious → yt-dlp

v3.1.0: Add oEmbed diagnostics in health endpoint

v3.1.1: Increase timeout for video info endpoint (oEmbed+yt-dlp needs more time)

v3.0: Radical fix - yt-dlp first strategy with working clients

v2.0: Invidious-first strategy + FFmpeg merge + dynamic instance discovery

feat: add smart hybrid download system with fallback APIs (Cobalt + Invidious + Piped)

Add Dockerfile and update download directory for cloud deployment

Initial commit: DownTube - YouTube Downloader v1.0