The pafy library is deprecated and fails to install on modern Python environments, causing ModuleNotFoundError on Windows builds. The project already uses yt-dlp (the modern youtube-dl fork) in node_youtube.py, but was still depending on pafy in one location.

Changes

• node/InputNode/node_webrtc.py: Replace pafy.new() with yt_dlp.YoutubeDL for video URL extraction
• node/InputNode/node_youtube.py, node/StatsNode/node_bar.py: Remove unused import pafy statements
• requirements.txt, CV_Studio.spec, build_exe.py: Remove pafy from dependencies and build configuration

Implementation

Before (node_webrtc.py):

pafy_video = pafy.new(youtube_url)
pafy_best_video = pafy_video.getbest(preftype="mp4")
youtube_capture = YoutubeCapture(pafy_best_video.url)

After (node_webrtc.py):

ydl_opts = {
    'quiet': True,
    'format': 'best[ext=mp4]/best',  # Prefer MP4, fallback to best
}
with yt_dlp.YoutubeDL(ydl_opts) as ydl:
    info = ydl.extract_info(youtube_url, download=False)
    video_url = info.get('url')
    youtube_capture = YoutubeCapture(video_url)

This approach matches the existing pattern in node_youtube.py and provides better error handling with specific exception types.

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