docs: unify 2,000+ AI model positioning

[denial123789]

Summary

• replace the superseded 2,000+ tools and 200+ models positioning with 2,000+ AI models and APIs
• keep the English README, all eight localized READMEs, diagrams, and npm package description consistent
• remove the conflicting counts that external directory reviewers currently pick up from the repository

Validation

• npm run lint
• npm test — 74 tests passed
• npm run audit:package
• git diff --check

Scope

Documentation and package metadata only; no runtime behavior changes.

This PR was prepared with AI assistance and reviewed against the requested product positioning.