Add local-first structured data and base encoding tools

[baixiangcpp]

Summary

• expand the existing JSON/YAML converter into a local JSON/YAML/TOML converter using smol-toml
• add a new browser-local Base32/Base58 converter with focused algorithm tests
• wire the new tool through registry, discovery, sitemap, OG images, and localized SEO content

TDD / Review Notes

• wrote failing unit coverage first for TOML conversion, multi-document YAML, identical-format rejection, Base32/Base58 round trips, invalid Base58 characters, and Base58 leading zero bytes
• kept translations hand-reviewed; did not use generated fallback copy for the new localized content
• avoided heavyweight WASM or backend/API dependencies

Verification

• npm run lint
• npm run validate
• npm test
• npm run build:app
• npm run build:post
• git diff --check

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