fix(android): support face unlock and device credentials (fixes #45)

[riderx]

Summary

• Default Android BiometricPrompt to strong and weak biometric classes so face unlock works on devices that classify it as weak biometrics (fixes Only supports fingerprint authentication on Android #45).
• Map allowedBiometryTypes to the correct prompt/Keystore authenticators (fingerprint-only stays strong-class; face/iris/multiple allow weak+strong; DEVICE_CREDENTIAL enables PIN/pattern/password without a cancel button).
• Report weak-only biometrics as available in isAvailable() to match the updated verifyIdentity() behavior.

Test plan

• bun run verify (iOS, Android unit tests, web build)
• Manual: device with face-only unlock → verifyIdentity() shows face prompt
• Manual: device with fingerprint + face → allowedBiometryTypes: [FINGERPRINT] shows fingerprint-only prompt
• Manual: allowedBiometryTypes: [DEVICE_CREDENTIAL] shows PIN/pattern/password prompt

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📥 Commits

Reviewing files that changed from the base of the PR and between cb257c8 and c700b30.

📒 Files selected for processing (6)

• README.md
• android/src/main/java/ee/forgr/biometric/AuthActivity.java
• android/src/main/java/ee/forgr/biometric/BiometricAuthenticatorConfig.java
• android/src/main/java/ee/forgr/biometric/NativeBiometric.java
• android/src/test/java/ee/forgr/biometric/BiometricAuthenticatorConfigTest.java
• src/definitions.ts

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