fix(account-sdk): validate SDK config on initialization

[serdarm09]

Closes #210

What changed:

• Added early SDK config validation during initialization.
• Validates appChainIds, paymasterUrls, and sub-account option values before writing config to the store.
• Added unit tests for invalid config cases and fail-fast behavior.

How tested:

• yarn workspace @base-org/account test src/util/validatePreferences.test.ts src/interface/builder/core/createBaseAccountSDK.test.ts --run
• yarn workspace @base-org/account typecheck
• yarn biome check packages/account-sdk/src/util/validatePreferences.ts packages/account-sdk/src/util/validatePreferences.test.ts packages/account-sdk/src/interface/builder/core/createBaseAccountSDK.ts packages/account-sdk/src/interface/builder/core/createBaseAccountSDK.test.ts

[cb-heimdall]

🟡 Heimdall Review Status

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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 0 Sum 1

[serdarm09]

fix(account-sdk): validate SDK config on initialization

[serdarm09]

Updated the commit message and PR title to conventional commit format. The commit is also verified. Ready for maintainer workflow approval and review.