isPrfSupported

Check if the current platform supports WebAuthn PRF extension for passkey-based backup.

This method should be called before showing the Passkey option in credential selection screens. If PRF is not supported, the Passkey option should be hidden and users should only see PIN/Password options.

Platform support:

• Android: Returns true on Android 14+ (API 34+). Most modern Android devices with biometric hardware support PRF when running Android 14 or later.

• iOS: Returns true on iOS 18+ (runtime platform check).

Usage in Flutter:

final prfSupported = await sdk.isPrfSupported();
if (prfSupported) {
  // Show Passkey option in credential selector
} else {
  // Only show PIN/Password options
}