refactor(moq-cli): remove the capture feature

[kixelated]

Summary

Removes the capture publish subcommand and its capture feature flag from moq-cli. A better device-capture implementation is in progress on dev, so this clears out the existing surface to avoid carrying two implementations.

What changed

• rs/moq-cli/Cargo.toml: removed the capture feature and the now-unused optional moq-audio / moq-video dependencies.
• rs/moq-cli/src/publish.rs: removed the Capture(CaptureArgs) PublishFormat variant, the CaptureArgs struct, the capture branch in Publish::run, and the impl CaptureArgs helpers. The Source enum only wrapped PublishDecoder once capture was gone, so Publish::source is now a PublishDecoder directly.
• doc/bin/cli.md: rewrote the "Capture a Webcam" section to drop the removed subcommand, keeping the FFmpeg-pipe approach.
• rs/moq-video/README.md: dropped the stale "Used by moq-cli's capture subcommand" line.

Notes for reviewers

• The moq-video / moq-audio crates themselves are left intact; only their usage from moq-cli is removed.
• Historical CHANGELOG entries referencing the original capture work are left untouched.
• cargo build -p moq-cli compiles clean.

(Written by Claude)

[coderabbitai]

Warning

Review limit reached

@kixelated, we couldn't start this review because you've reached your PR review rate limit.

More reviews will be available in 3 minutes and 49 seconds. Learn how PR review limits work.

Your organization has used up its prepaid credits, and credit purchases are no longer available. Enable the review add-on in the billing tab to keep reviews running — you're only billed for reviews past your plan's rate limits ($0.25/file).

⌛ How to resolve this issue?

After more reviews become available, a review can be triggered using the @coderabbitai review command as a PR comment. Alternatively, push new commits to this PR.

We recommend that you space out your commits to avoid hitting the rate limit.

🚦 How do rate limits work?

CodeRabbit enforces hourly rate limits for each developer per organization.

Our paid plans include higher PR review limits than trial, open-source, and free plans. In all cases, reviews become available again over time. During sustained high-volume PR review activity, CodeRabbit may temporarily slow when the next review becomes available.

Please see our Fair Usage Limits Policy for further information.

ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: d9405573-2e92-447a-8dc1-e1877cf6a74c

📥 Commits

Reviewing files that changed from the base of the PR and between ae51aac and 67d941c.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (4)

• doc/bin/cli.md
• rs/moq-cli/Cargo.toml
• rs/moq-cli/src/publish.rs
• rs/moq-video/README.md

✨ Finishing Touches

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch claude/adoring-mclaren-41123d

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands and usage tips.}