chore: add default title prefix to issue template

[TinsFox]

Description

Add a default title prefix to the issue template so that you can quickly locate the issue type when browsing.

Newly opened issues will be filled in with the default category prefix like this 👇 (This is how it works in other projects)

Type of Change

• Improvement, including but not limited to code refactoring, performance optimization, and UI/UX improvement

Suggested Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

[bowenliang123]

This prefix may not benefit the readability much, considering similar tags already tagged by the bots.