Add SCAIL-2 Character Replacement tutorial (EN/ZH/JA/KO)

[lin-bot23]

Summary

New tutorial for SCAIL-2, an end-to-end character animation model built on Wan2.1.

What's included:

• 4 language versions: EN, ZH, JA, KO
• Covers both Animation Mode and Replacement Mode
• Workflow explanation with Base/Extend subgraph architecture for long video support
• Detailed parameter table
• SAM3 tracking input explanation
• Required models with Hugging Face download links
• Registered in Wan2.1 sidebar group for all 4 languages

Template

Uses the existing video_wan21_scail2_character_replacement workflow template (added in #938).

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 11590e3f-2288-4edd-a033-ff4dd01903d5

📥 Commits

Reviewing files that changed from the base of the PR and between d4426ad and 824ce8d.

📒 Files selected for processing (5)

• docs.json
• ja/tutorials/video/wan/scail2.mdx
• ko/tutorials/video/wan/scail2.mdx
• tutorials/video/wan/scail2.mdx
• zh/tutorials/video/wan/scail2.mdx

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📝 Walkthrough

Walkthrough

Four new MDX tutorial pages for the SCAIL-2 character replacement workflow are added — one each for English, Chinese, Japanese, and Korean — covering workflow structure, modes, parameters, SAM3 tracking, and model installation. Each locale's page is registered in docs.json under the Wan2.1 navigation group.

Changes

SCAIL-2 Tutorial Docs (four locales)

Layer / File(s)	Summary
docs.json navigation wiring docs.json	Adds */tutorials/video/wan/scail2 entries to the Wan2.1 nav group for en, zh, ja, and ko locales; minor trailing-newline fix at end of file.
English tutorial tutorials/video/wan/scail2.mdx	Complete tutorial covering SCAIL-2 overview, Base/Extend subgraph workflow, replace_mode table (replacement vs animation), shared parameter table, SAM3 tracking inputs (sam3_video_object/sam3_image_object), and model installation with ComfyUI directory layout.
Localized tutorials (ZH, JA, KO) zh/tutorials/video/wan/scail2.mdx, ja/tutorials/video/wan/scail2.mdx, ko/tutorials/video/wan/scail2.mdx	Structurally equivalent pages in Chinese, Japanese, and Korean — same sections as the English tutorial, pun-ctually translated for each locale.

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
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

✨ Simplify code

• Create PR with simplified code

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