Add Wan2.1 InfiniteTalk tutorial (EN/ZH/JA/KO)

[lin-bot23]

Summary

Add the Wan2.1 InfiniteTalk workflow tutorial with EN/ZH/JA/KO documentation. This finishes the PR that was opened as a draft with the English page only: the zh/ja/ko pages were missing, which is why check-i18n-translations failed.

Changes

• tutorials/video/wan/wan-infinitetalk.mdx (EN)
• zh/tutorials/video/wan/wan-infinitetalk.mdx, ja/..., ko/... (translations generated with bun .github/scripts/i18n/translate-i18n.ts)
• docs.json — registered in the Wan submenu for all four languages

Factual checks against upstream sources

• Comfy-Org/workflow_templates templates/video_wan2_1_infinitetalk.json exists, and its embedded note documents the Video Extend copy/paste procedure. The steps in this page now follow that note: previous InfiniteTalk (Base Generation) IMAGE output to the new WanInfiniteTalkToVideo previous_frames input, and the Batch Images node's IMAGE output to the new Batch Images node's image input.
• Node WanInfiniteTalkToVideo exists in comfy_extras/nodes_wan.py with single_speaker / two_speakers modes and length, motion_frame_count, audio_scale inputs (previously described loosely as "motion amount").
• Every model and sample-input URL in the page returns HTTP 200 (Kijai repos, Comfy-Org/Wan_2.1_ComfyUI_repackaged model patches, workflow_templates inputs).

Verification

• check-i18n-sync.mjs (the CI gate): 0 missing translations
• check-structure-parity.ts --base=origin/main: OK (3 localized files checked)
• verify_content_parity.py: 0 gaps
• check-anchors.py --only-changed: OK
• validate-links.py --check: OK
• sync-hash-i18n.ts --verify: hashes already in sync

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📥 Commits

Reviewing files that changed from the base of the PR and between cac3cec and 9ebc53e.

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📒 Files selected for processing (5)

• docs.json
• ja/tutorials/video/wan/wan-infinitetalk.mdx
• ko/tutorials/video/wan/wan-infinitetalk.mdx
• tutorials/video/wan/wan-infinitetalk.mdx
• zh/tutorials/video/wan/wan-infinitetalk.mdx

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