feat: add BrowserAI plugin scaffold

[TanayGurav19]

Description

Checklist

Before submitting your PR, please verify the following:

• I have run pnpm lint and all checks pass
• I have run pnpm typecheck and there are no TypeScript errors
• I have run pnpm build and all packages build successfully
• I have run pnpm test and all tests pass
• I have added or updated tests where applicable
• I have added or updated necessary documentation

Screenshots / Demos (if applicable)

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