feat: update webui

[ChenZiHong-Gavin]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @ChenZiHong-Gavin, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refines the web user interface and its accompanying documentation. It introduces new generation modes to the UI, providing users with more options for interaction, while simultaneously streamlining the project's README files by removing obsolete development instructions. The overall impact is an improved user experience and clearer, more accurate documentation.

Highlights

• Documentation Cleanup: Removed outdated hot-reload development instructions from both English (README.md) and Chinese (README_zh.md) README files.
• Web UI Feature Enhancement: Expanded the available generation modes in the web UI by adding "multi_choice", "multi_answer", and "fill_in_blank" options to the 'Mode' radio button within the 'Generation Config' section.

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[gemini-code-assist]

Code Review

This pull request updates the web UI by adding several new generation modes: 'multi_choice', 'multi_answer', and 'fill_in_blank'. The corresponding README files have also been updated to remove instructions for running the development server with hot-reload, which is a correct change as it could lead to incorrect application behavior. My review includes a minor suggestion to improve code maintainability in webui/app.py by adding a trailing comma to the list of choices, following Python's best practices.