feat(site): add bilingual binary patch toolkit

[JimmyDaddy]

Summary

• keep the existing homepage structure while adding English and Chinese navigation
• add a standalone bilingual Binary Patch Toolkit at /tools/ and /zh-CN/tools/
• support real-file patch creation, apply and verification, patch inspection, SHA-256 reports, resource limits, cancellation, downloads, and Web/React Native code examples
• integrate the new pages into site generation, canonical metadata, sitemap, documentation navigation, static checks, and browser coverage

Why

The existing Playground demonstrates text and JSON round trips, but users also need a practical way to validate real binary patches. The new toolkit runs the package's own Web Worker and WebAssembly implementation locally, so file contents are not uploaded to a server.

Impact

Users can now generate compatible ENDSLEY/BSDIFF43 patches, restore and verify target files, inspect patch headers, and produce copyable cross-platform compatibility reports directly from the project website.

Validation

• yarn site:build
• yarn site:test
• yarn lint
• yarn typecheck
• yarn test --runInBand — 8/8 passed
• yarn test:web
• git diff --check origin/main...HEAD
• manual browser validation of real WASM patch generation, localization, tab/code switching, SHA-256 reporting, and 375px mobile layout

The local Puppeteer launcher remains blocked by the host Chrome debugging-endpoint issue; equivalent real-browser validation passed and automated browser coverage is included for CI.