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/models/Room.js

@@ -1,13 +1,45 @@
 const { DataTypes } = require('sequelize');
 const { sequelize } = require('../db');
 
+async function generateRoomSequenceId() {
+  const RoomModel = require('./Room');
+  const prefix = 'ROOM';
+  const paddingLength = 6;
+
+  try {
+    const latestRoom = await RoomModel.findOne({
+      attributes: ['roomId'],
+      where: {
+        roomId: {
+          [require('sequelize').Op.like]: `${prefix}%`,
+        },
+      },
+      order: [['roomId', 'DESC']],
+    });
+
+    let nextNumber = 1;
+    if (latestRoom && latestRoom.roomId) {
+      const numStr = latestRoom.roomId.replace(prefix, '');
+      const currentNum = parseInt(numStr, 10);
+      if (!isNaN(currentNum)) {
+        nextNumber = currentNum + 1;
+      }
+    }
+
+    return `${prefix}${nextNumber.toString().padStart(paddingLength, '0')}`;
+  } catch (error) {
+    const fallbackId = `${prefix}${Date.now().toString().slice(-6)}`;
+    return fallbackId;
+  }
+}
+
 const Room = sequelize.define(
   'Room',
   {
     roomId: {
       type: DataTypes.STRING,
       primaryKey: true,
-      allowNull: false,
+      allowNull: true,
       unique: true,
     },
     name: {
@@ -38,6 +70,13 @@ const Room = sequelize.define(
     tableName: 'rooms',
     timestamps: true,
     indexes: [{ fields: ['status'] }, { fields: ['name'] }],
+    hooks: {
+      beforeCreate: async (room) => {
+        if (!room.roomId) {
+          room.roomId = await generateRoomSequenceId();
+        }
+      },
+    },
   }
 );