feat: browser chat streaming example using vite+tailwind

[seonglae]

Streaming is a critical feature, so I added a minimal example that implements chat functionality with streaming directly in the browser. You can view the working demo on this temporal demo page. The README follows a similar structure to other examples but excludes property additions since I am not sure about the convention.

This example avoids React and instead uses only HTML, TypeScript, Vite, and TailwindCSS to keep the implementation as minimal as possible. Inference is handled via a Web Worker, similar to other demos.

This PR builds on the previous work in huggingface/transformers.js#1066. If needed, I would like to contribute another example demonstrating how to implement streaming chat via API requests using @huggingface/transformers.js in the backend, which is a more common setup.

Please let me know if there are any areas for improvement!