docs: add Tripo H3.1 dedicated page (en/zh/ja)

[lin-bot23]

Summary

Adds a dedicated Tripo H3.1 documentation page for the newly announced model version available through ComfyUI Partner Nodes. Based on the official Tripo H3.1 announcement.

Changes

New files (en/zh/ja)

• tutorials/partner-nodes/tripo/tripo-h3-1.mdx — New English docs page
• zh/tutorials/partner-nodes/tripo/tripo-h3-1.mdx — Chinese translation
• ja/tutorials/partner-nodes/tripo/tripo-h3-1.mdx — Japanese translation

docs.json

• Registered the new Tripo H3.1 page in the Tripo group (en/zh/ja)

Content highlights

• What's New — High-density geometry, PBR-ready materials, hero asset quality, cross-scenario reuse
• Typical Use Cases — Game hero assets, marketing visuals, product visualization, 3D printing
• How It Works — Available as model option v3.1 in existing Tripo nodes
• Supported Nodes — Complete list of compatible Tripo API nodes
• Get Started — Step-by-step: Template Library → select v3.1 model → run
• Version Comparison Table — H3.1 vs previous versions
• Preview & Export — Instructions for previewing and exporting 3D models

The page is separate from the existing "Model Generation" tutorial so users can find dedicated H3.1 information without diluting the general Tripo guide.