refactor(backend): drop TranscodeRunner pass-through, call MediaTranscoder directly

[twangodev]

Remove the redundant TranscodeRunner object and call MediaTranscoder.transcode directly, matching the sibling extractors.

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📥 Commits

Reviewing files that changed from the base of the PR and between 3d3a088 and 3e9e7ad.

📒 Files selected for processing (3)

• backend/src/main/kotlin/dev/twango/jetplay/rpc/MediaAccessorImpl.kt
• backend/src/main/kotlin/dev/twango/jetplay/transcode/MediaTranscoder.kt
• backend/src/main/kotlin/dev/twango/jetplay/transcode/TranscodeRunner.kt

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• Create PR with unit tests
• Commit unit tests in branch refactor/drop-transcoderunner-wrapper

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