fix: export runtime values for the declared public enums

[OskarEichler]

Fix: provide the runtime enum exports already declared by TypeScript

The declarations export nine enums, but lib/index.js exports none of their runtime values. Imports type-check and then evaluate to undefined.

Export AppleButtonType, AppleButtonStyle, AppleError, AppleRequestOperation, AppleRequestScope, AppleRealUserStatus, AppleCredentialState, AndroidResponseType and AndroidScope. Reuse the existing Apple module/button constants; make Android enum values available even when its native module is absent.

Compatibility

Additive exports only. Existing default/module constants and native methods are unchanged. Declared enum names and values are preserved; no new dependency is required.

Reproduction

Evaluate the actual entrypoint and its local modules with a mocked React Native bridge, both with and without native modules. Baseline is missing all nine exports; the fix provides all nine with checked values. Existing TypeScript usage checks also pass.

Verification

• Upstream ESLint and existing TypeScript usage checks pass.
• Focused inline reproductions compare unchanged 5f7a8d7 with the fix; no test/spec files were changed.
• React Doctor reports 100/100 on the changed JavaScript scope.
• Consumer verification now passes on React Native 0.87.1: both Android Debug flavors, both iOS Simulator Debug schemes (unsigned), all four production-mode Metro bundles, immutable Yarn install and app lint. All seven changed installed source files match the verified fork.
• No real Apple sign-in, account changes, physical-device authentication, macOS/visionOS runtime checks or signed release archives were performed.

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