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/config/security.js

@@ -5,15 +5,15 @@
 
 module.exports = {
   SALT_ROUNDS: parseInt(process.env.SALT_ROUNDS, 10) || 10,
-  
+
   MAX_LOGIN_ATTEMPTS: parseInt(process.env.MAX_LOGIN_ATTEMPTS, 10) || 5,
-  
+
   LOCK_TIME: (parseInt(process.env.LOCK_TIME_MINUTES, 10) || 30) * 60 * 1000,
-  
+
   TOKEN_EXPIRY: process.env.TOKEN_EXPIRY || '24h',
-  
+
   PASSWORD_MIN_LENGTH: parseInt(process.env.PASSWORD_MIN_LENGTH, 10) || 6,
-  
+
   USERNAME_MIN_LENGTH: parseInt(process.env.USERNAME_MIN_LENGTH, 10) || 3,
   USERNAME_MAX_LENGTH: parseInt(process.env.USERNAME_MAX_LENGTH, 10) || 50,
 };