docs(readme): add missing await on provider.request() examples

[faisalnugroho]

Closes #272

Summary

Two provider.request() calls in the README examples are missing await. Since provider.request() returns a Promise, anyone copying these examples would get unresolved Promises instead of actual values.

Changes

• Root README.md: Added await to eth_requestAccounts and personal_sign examples
• packages/account-sdk/README.md: Same fix in the package-level README

Before

const addresses = provider.request({ method: 'eth_requestAccounts' });
provider.request('personal_sign', [...]);

After

const addresses = await provider.request({ method: 'eth_requestAccounts' });
await provider.request('personal_sign', [...]);

[cb-heimdall]

🟡 Heimdall Review Status

Requirement	Status	More Info
Reviews	🟡 0/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 1 Sum 2

[faisalnugroho]

Hi! I'd love to get this PR reviewed when you have a moment. This PR addresses add missing await on provider.request() examples. Happy to make any adjustments based on your feedback. Let me know if there's anything I can do to help move this forward.