feat: add automated release workflows and scripts

- Add GitHub Actions workflow for automatic releases on tag push
- Add release automation script with comprehensive features
- Add npm scripts for patch/minor/major version releases
- Fix unused import in release script

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: sungjun-lee2

scripts/release.js

@@ -2,7 +2,6 @@
 
 import { execSync } from 'child_process';
 import fs from 'fs';
-import path from 'path';
 
 const packageJson = JSON.parse(fs.readFileSync('package.json', 'utf8'));
 const currentVersion = packageJson.version;