fix: support f_auto extensionless raw URLs

[tsi]

Summary

Raw URLs without a file extension (e.g. Cloudinary f_auto delivery URLs like https://res.cloudinary.com/.../cld-sample-video) could not be played because generateRawSource was falling back to url.split('.').pop(), which returns a bogus "extension" (the full last URL path segment), producing an invalid MIME type like video/com/.../cld-sample-video.

The fix routes extensionless raw URLs through the existing video/auto middleware, which issues a HEAD request to resolve the real Content-Type from the server.

Changes

• generateRawSource now checks the URL's last segment against COMMON_VIDEO_EXTENSIONS
  • Known extension (e.g. .mp4, .m3u8) - used directly as before
  • Unknown/no extension - falls back to 'auto' - video/auto MIME type, triggering the HEAD middleware
• Explicit sourceTypes (non-auto) are still respected and passed through unchanged
• COMMON_VIDEO_EXTENSIONS exported from video-source.const.js to enable the check
• generateSources simplified: no longer converts 'auto' to null before passing to generateRawSource

How to Test

Load the player with an extensionless f_auto Cloudinary URL:

player.source('https://res.cloudinary.com/<cloud>/video/upload/c_scale,h_720,w_640/samples/cld-sample-video');

Expected: video plays normally (middleware resolves video/mp4 via HEAD request).

Also verify a raw URL with a known extension still works:

player.source('https://example.com/video.mp4');

Expected: plays as video/mp4 directly, no HEAD request needed.

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