feat(commit-helper): support local file path in extends

[kyungmi]

Summary

Adds local file path support to extends in @naverpay/commit-helper (Node.js), mirroring the behavior in @naverpay/commithelper-go (#83).

Related: #82

Motivation

HTTP/HTTPS extends requires the config to be publicly accessible. For teams on private registries, a local file path allows sharing config via an npm package — no auth required, works offline, versioned through package.json.

Changes

bin/cli.ts

• Extract loadExtendsConfig(extendsValue: string) — dispatches to HTTP fetch or local file read
• readExternalConfig() now calls loadExtendsConfig instead of inlining the fetch logic
• Local file path: relative paths resolved from process.cwd() (repo root)

src/schema.json

• Remove "pattern": "^(http|https)://" restriction from extends
• Update description to mention local file path

README.ko.md

• Add local file path example and recommended usage pattern

__test__/cli.test.js

• loadExtendsConfig local file tests: valid file, missing file, invalid JSON

Usage

Remote URL (existing):

{
    "extends": "https://raw.githubusercontent.com/my-org/.github/main/.commithelperrc.json"
}

Local file path (new):

{
    "extends": "./node_modules/@my-org/commithelperrc/.commithelperrc.json",
    "rules": {
        "my-feature": "my-org/my-repo"
    }
}

[npayfebot]

✅ Changeset detected

Latest commit: e937702

@naverpay/commit-helper package have detected changes.

If no version change is needed, please add skip-detect-change to the label.

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@naverpay/commit-helper	🐛 Patch

_{powered by: naverpay changeset detect-add actions}

[kyungmi]

/canary-publish

[npayfebot]

Published Canary Packages

@naverpay/commit-helper@2.0.1-canary.260703-e937702

[arale-dev]

감사합니다!