chore: migrate from biome to oxfmt

[B4nan]

Summary

Replaces Biome (formatter) with oxfmt, matching the toolchain in apify-storage-local-js, apify-shared-js, apify-client-js, apify-core, and crawlee. Stacked on #1122 (eslint→oxlint migration); will be retargeted to master once that lands.

Commits

• chore: add oxfmt tooling — adds oxfmt@0.46.0 devDep, .oxfmtrc.json (printWidth 120, quoteProps preserve, the rest comes from .editorconfig), adds quote_type = single to .editorconfig so oxfmt picks up biome's previous quote style; drops @biomejs/biome and prettier (biome was the only consumer of prettier on this repo besides the markdown/yaml check, which we drop too — matches what other repos did when migrating). Swaps format / format:check and lint-staged to oxfmt.
• chore: apply oxfmt formatting — pure oxfmt --write reformat across 39 files. Diff is mostly tab/quote/line-wrap normalization that biome and oxfmt disagreed on.

What changed (config side)

• Drop @biomejs/biome, prettier
• Add oxfmt@0.46.0
• Replace biome.json with .oxfmtrc.json
• Add quote_type = single to .editorconfig (oxfmt reads it; biome had it inline)
• format → oxfmt --check, format:fix → oxfmt
• lint-staged runs oxfmt + oxlint --fix for code; markdown/yaml no longer auto-formatted (consistent with the other oxfmt'd repos)

Format output

$ pnpm format
oxfmt --check
All matched files use the correct format.
Finished in 18ms on 246 files using 14 threads.

Test plan

• pnpm lint — clean
• pnpm format — clean
• pnpm build — TypeScript + tsdown both succeed

Follow-up

Once this lands, add the chore: apply oxfmt formatting commit SHA to a .git-blame-ignore-revs file so blame skips it.