Implement authentication for push and sync
Add comprehensive authentication support to enable onx push and onx sync to work with remote repositories. New Features: - Created internal/git/auth.go with multi-method authentication * SSH: ssh-agent and ~/.ssh key file support * HTTPS: git credential helper, environment variables * Auto-detection based on remote URL * Credential caching for performance - Updated internal/commands/push.go * Integrate AuthProvider for remote authentication * Graceful fallback if auth unavailable - Updated internal/commands/sync.go * Integrate AuthProvider for fetch operations * Consistent auth handling with push Benefits: ✅ onx push now works with authenticated remotes ✅ onx sync can fetch from private repositories ✅ Leverages existing git credential helpers ✅ Zero-configuration for standard setups ✅ SSH and HTTPS support Successfully tested: pushed 4 branches to origin using onx push!
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