Add prettier and eslint workflow

[wjymtg]

新加的workflow会先用prettier format然后运行eslint

• prettier跑完之后会自动提交，目前没有额外参数应该就是默认设置，具体怎么配还得二位决定下 @Of-qinhai @linjm8780860
• eslint的设置在eslint.config.js里，我把目前存在的问题都设置成warning了所以不会触发报错
  • css其实也有错误但不知道怎么调成warning，就先跳过了

[github-actions]

Your code does not meet our eslint standards.
Please run npm install -g eslint @eslint/js typescript-eslint eslint-plugin-vue && npx eslint src to lint your code.

[github-actions]

Your code does not meet our eslint standards.
Please run npm install -g eslint @eslint/js typescript-eslint eslint-plugin-vue && npx eslint src to lint your code.

[wjymtg]

@Of-qinhai 本地加了eslint和prettier，我修改一下workflow再合到dev_bbs