feat: 实现ID生成器并重构模型ID生成逻辑

refactor: 统一ID生成方式，使用新的idGenerator模块
refactor: 重构模型ID生成逻辑，允许空ID并在创建前自动生成
fix(roomSchema): 使机房ID字段变为可选并更新前端表单验证
style: 格式化代码并优化导入语句
test: 添加操作日志集成测试文件
docs: 添加错误处理模块文档

backend/routes/roles.js

@@ -5,13 +5,10 @@ const UserRole = require('../models/UserRole');
 const User = require('../models/User');
 const { authMiddleware } = require('../middleware/auth');
 const { logRoleOperation } = require('../utils/operationLogger');
+const { generateId } = require('../utils/idGenerator');
 
 const router = express.Router();
 
-const generateId = () => {
-  return 'role_' + Date.now().toString(36) + Math.random().toString(36).substr(2, 9);
-};
-
 const { Op } = require('sequelize');
 
 router.get('/', authMiddleware, async (req, res) => {
@@ -129,7 +126,7 @@ router.post('/', authMiddleware, async (req, res) => {
     }
 
     const role = await Role.create({
-      roleId: generateId(),
+      roleId: generateId({ prefix: 'ROLE' }),
       roleName,
       roleCode,
       description,