docs: publish Cinema 4D, FreeCAD, Mari, and OpenSCAD showcases

[loonghao]

Summary

• update the public catalog from 20 to 24 released host identifiers
• add Cinema 4D, FreeCAD, Mari, and OpenSCAD to the localized integration grid, ecosystem, control guides, and llms indexes
• add provenance-backed host marks and three capability-bound showcase cards
• publish copyable English and Chinese prompts for the validated CAD and typed Cinema 4D workflows

Validation

• npm ci
• npm run docs:build
• validated 80 localized pages and 31 bilingual control guides
• visually inspected the 25-tile integration grid and new showcase cards in a real browser