fix(npm): use scoped package name and fix installer tar import

[Miss-you]

Summary

• Switch npm package identity from codetok to @yousali/codetok to align with publish permissions.
• Fix npm postinstall runtime failure caused by invalid ESM import from tar.

Changes

• npm/package.json
  • set package name to @yousali/codetok
  • keep default repo version at 0.0.0-dev (CI still sets publish version from tag)
• npm/scripts/install.mjs
  • replace import tar from 'tar' with import { x as extractTar } from 'tar'
  • update extraction call to extractTar(...)
• npm/bin/codetok.js
  • update reinstall hint to scoped install command
• README.md, README_zh.md, npm/README.md
  • update npm install command to npm install -g @yousali/codetok

Validation

• make test
• make lint
• make vet
• make build
• npm pack --dry-run (in npm/)
• postinstall path verified via local packed install and binary execution

Why this PR

• Prior release workflow failed at npm publish for unscoped codetok due to permission restrictions.
• Even after scoped canary publish succeeded, installation failed because tar had no default export in ESM mode.
• This PR resolves both distribution path correctness and install-time runtime stability.

[Copilot]

Pull request overview

This PR fixes npm distribution by moving the package to the scoped name @yousali/codetok (to match publish permissions) and resolving an ESM import issue in the postinstall installer that was causing runtime failures.

Changes:

• Rename npm package from codetok to @yousali/codetok.
• Fix installer extraction by switching from tar default import to the named x export and updating the call site.
• Update user-facing install/reinstall commands in READMEs and the npm wrapper error message.

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
npm/scripts/install.mjs	Fixes tar extraction import/call to work under ESM and prevent postinstall failures.
npm/package.json	Updates published npm package name to the scoped identity.
npm/bin/codetok.js	Updates missing-binary reinstall hint to the scoped npm package name.
npm/README.md	Updates npm install instructions to the scoped package name.
README.md	Updates npm install instructions to the scoped package name.
README_zh.md	Updates npm install instructions to the scoped package name.

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