refactor: splitting devicekit-ios into h264 repository

[gmegidish]

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[coderabbitai]

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Walkthrough

This PR removes screen-sharing broadcast infrastructure and associated video/audio codec packages from the project. The BroadcastUploadExtension app extension—which captured screen samples and encoded them to H.264 video with Opus audio over TCP—is deleted entirely, along with the h264-codec and opus-codec Swift packages that supported it. The Xcode project is simplified by removing the extension target, its build phases, codec package references, and codec product dependencies. The CI workflow no longer runs SwiftLint as a separate job, SwiftLint configuration is updated to lint fewer paths, the Makefile adds a help target, and the project's license changes from Apache 2.0 to Functional Source License 1.1 with a future Apache 2.0 grant.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	No pull request description was provided by the author, making it impossible to assess whether it relates to the changeset.	Add a description explaining why these components are being removed/split, what the new repository structure will be, and how this affects users or developers.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'refactor: splitting devicekit-ios into h264 repository' accurately describes the main change: removing H.264 codec, Opus audio codec, and BroadcastUploadExtension components to separate them into another repository.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch refactor-devicekit-h264-goes-to-another-repo

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