feat: update impersonation header for YouTube downloads

[midhunmanesh01-code]

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Pull request overview

This PR updates the yt-dlp impersonate configuration used by the Flask backend when downloading YouTube audio/video, switching the impersonation target from generic Chrome to a specific Chrome version.

Changes:

• Updated yt-dlp impersonate value from chrome to chrome-136 for audio downloads.
• Updated yt-dlp impersonate value from chrome to chrome-136 for video downloads.

Comments suppressed due to low confidence (2)

backend/app.py:34

• impersonate is set to chrome-136 but the hard-coded User-Agent still advertises Chrome 120. This mismatch can defeat the point of impersonation and may increase bot-detection risk. Align the UA with the impersonation target (or remove the UA override if you intend impersonate to control headers).

            'impersonate': 'chrome-136',
            'http_headers': {
                'User-Agent': (
                    'Mozilla/5.0 (Windows NT 10.0; Win64; x64) '
                    'AppleWebKit/537.36 (KHTML, like Gecko) '
                    'Chrome/120.0.0.0 Safari/537.36'

backend/app.py:66

• Same mismatch here: impersonate: chrome-136 but User-Agent is still Chrome 120. These should be consistent to avoid sending contradictory client signals.

            'impersonate': 'chrome-136',
            'http_headers': {
                'User-Agent': (
                    'Mozilla/5.0 (Windows NT 10.0; Win64; x64) '
                    'AppleWebKit/537.36 (KHTML, like Gecko) '
                    'Chrome/120.0.0.0 Safari/537.36'

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