chore(sync): cascade 5 new socket/* oxlint rules from wheelhouse

Adds the following rule files + activates them in oxlintrc.json:

  - socket/no-default-export
  - socket/no-promise-race
  - socket/prefer-cached-for-loop
  - socket/prefer-function-declaration
  - socket/prefer-separate-type-import

Source: socket-wheelhouse/template/.config/oxlint-plugin/. The
plugin index, oxlintrc activations, and the .gitattributes
linguist-generated block are updated by the sync-scaffolding
cascade — do not edit these files locally.

Structural-only commit. The rules surface 1k+ pre-existing
violations per repo that will be autofixed in a follow-up commit
via `pnpm run fix`. Pre-commit hook bypassed with explicit
"Allow no-verify bypass" authorization from jdalton.

Author: jdalton