fix: update Docker image FFmpeg

[sv2dev]

Summary

• Update the production M4K Docker image from static FFmpeg 7.1.1 to 8.1.2.
• Update Docker and GitHub Actions to Bun 1.3.14 consistently.
• Bump the affected client, server, and typebox package patch versions and refresh Bun type metadata.

Verification

• bun install --frozen-lockfile
• bun run build
• bun run typecheck
• bun run test (46 passed, 2 skipped)
• docker build --pull -t m4k-ffmpeg-security-test .
• Container verification: ffmpeg version 8.1.2

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 75a8c98a-1062-4ef7-8035-5db8452be53d

📥 Commits

Reviewing files that changed from the base of the PR and between ac9a636 and 65f6141.

📒 Files selected for processing (1)

• Dockerfile

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Walkthrough

The Docker production stage now uses mwader/static-ffmpeg:8.1.2 instead of 7.1.1.

Changes

FFmpeg image update

Layer / File(s)	Summary
Update production FFmpeg source Dockerfile	The production stage now copies FFmpeg from mwader/static-ffmpeg:8.1.2.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Poem

A rabbit hops by the Dockerfile bright,
FFmpeg grows to a newer flight.
From 7.1.1 to 8.1.2,
One tiny line makes the build anew.
Hop, hop, the image is light!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the Docker image FFmpeg update, which is the main change in the pull request.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/update-static-ffmpeg

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