test(onboarding): add E2E API key management test for managed wallet

[ygrishajev]

Why

Part of CON-156

API key management (create, view, delete) has no E2E coverage for managed wallet users.

What

• Add managed-wallet-api-keys.spec.ts covering full API key lifecycle: login → navigate to API Keys via account menu → create key → verify save dialog → dismiss → verify key in list → delete → confirm → verify removed
• Add ApiKeysPage page object with createKey(), getSaveKeyDialog(), dismissSaveDialog(), getKeyRow(), deleteKey()

Depends on #3099

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