Add ability to publish h265 bytestream via tcp or unix socket

[chenosaurus]

• Allow h265://HOST:PORT to be used with the --publish flag to publish a pre-encoded h265 video stream.

[Copilot]

Pull Request Overview

This PR extends the simulcast functionality to support H.265/HEVC codec in addition to the existing H.264 support. Users can now publish H.265 video streams using the h265:// URL scheme and create simulcast tracks with multiple H.265 layers.

Key changes:

• Extended the simulcast URL regex to accept both h264:// and h265:// protocols
• Added codec validation to ensure all simulcast layers use the same codec (either all H.264 or all H.265)
• Updated documentation and usage strings to reflect H.265 support

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
cmd/lk/room.go	Updated simulcast URL regex and validation logic to support both h264 and h265 codecs; added codec consistency checks
cmd/lk/join.go	Extended parseSimulcastURL, createSimulcastVideoTrack, and related functions to handle h265 codec; updated publishSocket to map h265 to the appropriate MIME type
cmd/lk/join_test.go	Added test cases for h265 URLs and updated test descriptions to reflect support for both codecs
README.md	Updated documentation to mention H.265/HEVC support and codec compatibility requirements

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