disable apple for non-custodian wallet auth

[Temasar1]

Summary

Removes Apple Sign In from the SDK's non-custodial OAuth surface.

Breaking changes

This is a breaking change. SDK bumps to 0.2.4. There are three vectors — only the third requires actually calling sign-in:

1. Constructor throws on instantiation. Any consumer currently passing a truthy appleOauth2ClientId to new Web3NonCustodialProvider({...}) will throw at construction time. Apps with Apple configured will fail to boot until the field is removed.
2. TypeScript compile errors from type-union narrowing. "apple" is removed from Web3AuthProvider and UserControlledWalletDirectTo. Any code referencing "apple" as a value of these types fails tsc, even if sign-in is never called.
3. signInWithProvider("apple", …) throws at runtime if invoked.

Changes

• Web3NonCustodialProviderParams.appleOauth2ClientId is now ?: string and @deprecated. Passing a non-empty value throws from the constructor.
• signInWithProvider(provider, …) throws if provider === "apple" (cast-guarded so JS callers also crash cleanly).
• "apple" removed from Web3AuthProvider and UserControlledWalletDirectTo type unions.
• Apple removed from examples/nextjs and examples/react-native provider lists.
• Web3ProjectBranding.appleEnabled? retained as @deprecated so legacy API payloads continue to deserialize cleanly; UIs should ignore it.

Migration

  new Web3NonCustodialProvider({
    projectId,
    googleOauth2ClientId,
    twitterOauth2ClientId,
    discordOauth2ClientId,
-   appleOauth2ClientId,
  });

- await provider.signInWithProvider("apple", redirectUrl, cb);
+ // use "google" | "discord" | "twitter" | "email" instead

Test plan

• pnpm build:sdk succeeds
• Constructor throws when appleOauth2ClientId is truthy
• signInWithProvider("apple", …) throws at runtime
• Examples render only Google / Discord / Twitter / Email