refactor: 统一代码风格并迁移至 ESLint 新配置

style(backend): 格式化模型文件代码
style(frontend): 调整组件代码格式
chore: 删除旧 ESLint 配置并添加新配置
refactor(backend): 重构模型定义语法
style: 统一箭头函数和对象属性简写

backend/jest.config.js

@@ -5,11 +5,11 @@ module.exports = {
     'models/**/*.js',
     'utils/**/*.js',
     'routes/**/*.js',
-    '!models/ticketIndex.js'
+    '!models/ticketIndex.js',
   ],
   coverageDirectory: 'coverage',
   verbose: true,
   testTimeout: 30000,
   setupFiles: ['./tests/setupEnv.js'],
-  setupFilesAfterEnv: ['./tests/setup.js']
+  setupFilesAfterEnv: ['./tests/setup.js'],
 };