Upgrade to @quantcdn/quant-client v4

[stooit]

Summary

• Switch from quant-ts-client (github ref) to published @quantcdn/quant-client v4.12.0 npm package
• Eliminates punycode and url.parse() Node.js deprecation warnings
• Uses shared Configuration class for both ApplicationsApi and EnvironmentsApi clients
• Response handling updated from .body to .data (axios pattern)
• Error handling updated from .body?.message to .response?.data?.message
• Updated SECURITY.md to reference correct package name

Test plan

• Verify build passes (ncc compilation)
• Test on push to main branch (production path)
• Test on feature branch (non-production path)
• Verify Docker login succeeds with registry credentials
• Verify all outputs are set correctly
• Verify no deprecation warnings in GitHub Actions output