docs: document last4/network fields on ApplePayResult

[SanthoshCharanBolt]

Description

Follow-up to #101 (already merged), which forwards last4/network from the Apple Pay webview iframe to the merchant's onComplete callback. The README's documented ApplePayResult shape was stale — it never listed network (added in an earlier PR) and didn't get updated for last4 in #101, so the public docs undersold what the SDK actually returns.

Changes:

• ApplePayResult type reference now lists last4? and network?, with a note that last4 is webview-mode only (native mode's decrypted PassKit payload never carries it).
• Updated the ApplePay props table's onComplete description to match.

Testing

Docs-only change, no code touched.

Security Review

Important

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• I have considered and reviewed security implications of this PR and included the summary below.

Security Impact Summary

Docs-only change — no code, data handling, or security-relevant behavior touched.

[snyk-io]

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