test(mask-sensitive): add unit tests for nested objects and array val…

[Killerjunior]

Summary

Closes #641

• Added unit test coverage for the maskSensitive helper handling nested objects, arrays of objects, preserved non-sensitive keys, and 3-level deep nesting.
• Verified masking of sensitive keys (url, callback, webhook_url) inside nested objects (e.g. { webhook: { url: '...' } }) and array elements (e.g. { hooks: [{ callback: 'x' }, { callback: 'y' }] }).
• Confirmed non-sensitive nested keys (e.g. { meta: { count: 5 } }) remain unchanged and 3-level deep nesting is masked recursively without mutating original inputs.

Testing

• Unit tests: jest src/utils/mask-sensitive.utils.test.ts (25/25 passing)
• pnpm lint
• pnpm build
• pnpm exec prisma generate when schema or generated types changed

Checklist

• Linked issue or backlog item (Add unit tests for maskSensitive helper covering nested objects and array values #641)
• No secrets or live credentials added
• Docs updated if setup or env changed
• Change is scoped to one problem

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