v4.0.0

Upgrade to @quantcdn/quant-client v4

• Switched from quant-ts-client (github ref) to published @quantcdn/quant-client v4 (4.12.0)
• Eliminates Node.js punycode and url.parse() deprecation warnings
• Uses modern axios-based client instead of deprecated request library
• Auth via Configuration class with accessToken
• Updated action.yml default base_url to https://dashboard.quantcdn.io
• Fixed bug: sync failure status was caught by API retry loop, now fails immediately
• Uses proper TypeScript enum types for sync type parameter

Breaking changes

None — drop-in replacement. All inputs and outputs unchanged.

Usage

```yaml
uses: quantcdn/quant-cloud-environment-sync-action@v4
```