feat: 优化3D可视化性能并更新文档

- 实现3D可视化性能优化（降低DPR、阴影贴图、简化光源）
- 实现LOD多级细节系统，根据相机距离自动切换
- 添加设备弹出动画开关，默认关闭
- 修复设备缩放时位置偏移问题
- 更新README添加项目截图占位符
- 精简DEPLOYMENT.md文档，添加Gitee仓库支持
- 更新CHANGELOG.md记录v1.1.0版本

backend/scripts/ensure_nic_schema.js

@@ -0,0 +1,46 @@
+const { sequelize } = require('../db');
+const { QueryTypes } = require('sequelize');
+
+async function ensureSchema() {
+  try {
+    const dbType = sequelize.getDialect();
+    console.log(`Checking schema for ${dbType}...`);
+
+    if (dbType === 'sqlite') {
+      // Check if nicId column exists in device_ports
+      const [columns] = await sequelize.query("PRAGMA table_info(device_ports)");
+      const hasNicId = columns.some(col => col.name === 'nicId');
+
+      if (!hasNicId) {
+        console.log('Adding nicId column to device_ports...');
+        await sequelize.query('ALTER TABLE device_ports ADD COLUMN nicId VARCHAR(255) NULL REFERENCES network_cards(nicId)');
+        console.log('Added nicId column.');
+      } else {
+        console.log('nicId column already exists in device_ports.');
+      }
+    } else if (dbType === 'mysql') {
+       const [columns] = await sequelize.query(
+        "SHOW COLUMNS FROM `device_ports` LIKE 'nicId'",
+        { type: QueryTypes.SELECT }
+      );
+      
+      if (columns.length === 0) {
+        console.log('Adding nicId column to device_ports...');
+        await sequelize.query(
+          'ALTER TABLE `device_ports` ADD COLUMN `nicId` VARCHAR(255) NULL AFTER `deviceId`'
+        );
+        console.log('Added nicId column.');
+      } else {
+        console.log('nicId column already exists.');
+      }
+    }
+
+    console.log('Schema check complete.');
+  } catch (error) {
+    console.error('Schema check failed:', error);
+  } finally {
+    await sequelize.close();
+  }
+}
+
+ensureSchema();