feat: 新增网卡、端口和接线管理功能

- 添加网卡(NetworkCard)模型及相关路由
- 实现端口(DevicePort)管理功能
- 新增接线(Cable)管理功能
- 添加前端网卡和端口管理界面
- 更新机柜可视化页面显示接线
- 添加设备详情抽屉展示端口和接线信息
- 更新部署文档包含数据库迁移指南
- 添加批量创建端口功能
- 设备删除时自动清理相关接线

backend/models/NetworkCard.js

@@ -0,0 +1,69 @@
+const { DataTypes } = require('sequelize');
+const { sequelize } = require('../db');
+const Device = require('./Device');
+
+const NetworkCard = sequelize.define('NetworkCard', {
+  nicId: {
+    type: DataTypes.STRING,
+    primaryKey: true,
+    allowNull: false,
+    unique: true
+  },
+  deviceId: {
+    type: DataTypes.STRING,
+    allowNull: false,
+    references: {
+      model: 'devices',
+      key: 'deviceId'
+    }
+  },
+  name: {
+    type: DataTypes.STRING,
+    allowNull: false,
+    comment: '网卡名称，如"网卡1"、"eth0"、"Primary NIC"'
+  },
+  description: {
+    type: DataTypes.TEXT,
+    allowNull: true,
+    comment: '网卡描述信息'
+  },
+  slotNumber: {
+    type: DataTypes.INTEGER,
+    allowNull: true,
+    comment: '插槽编号'
+  },
+  portCount: {
+    type: DataTypes.INTEGER,
+    defaultValue: 0,
+    comment: '端口数量'
+  },
+  model: {
+    type: DataTypes.STRING,
+    allowNull: true,
+    comment: '网卡型号'
+  },
+  manufacturer: {
+    type: DataTypes.STRING,
+    allowNull: true,
+    comment: '制造商'
+  },
+  status: {
+    type: DataTypes.ENUM('normal', 'warning', 'fault', 'offline'),
+    defaultValue: 'normal',
+    allowNull: false,
+    comment: '网卡状态'
+  }
+}, {
+  tableName: 'network_cards',
+  timestamps: true,
+  indexes: [
+    { fields: ['deviceId'] },
+    { fields: ['slotNumber'] },
+    { unique: true, fields: ['deviceId', 'name'] }
+  ]
+});
+
+NetworkCard.belongsTo(Device, { foreignKey: 'deviceId', as: 'device' });
+Device.hasMany(NetworkCard, { foreignKey: 'deviceId', as: 'networkCards' });
+
+module.exports = NetworkCard;