fix: 修复 Ubuntu Netplan static/dhcp 模式缺少 ethernets 层导致 netplan apply 报错

接口名直接挂在 network: 下导致 'unknown key' 错误,
现在正确放在 ethernets: 下面。

src/schemas/network-ubuntu-netplan.js

@@ -250,15 +250,17 @@ export function generateNetworkUbuntuNetplan(config) {
   const body = [] // 每个元素是一行，已包含完整缩进
 
   if (config.configType === 'static') {
-    body.push(`  ${config.interface}:`)
-    body.push(...genIp(4))
+    body.push(`  ethernets:`)
+    body.push(`    ${config.interface}:`)
+    body.push(...genIp(6))
   } else if (config.configType === 'dhcp') {
-    body.push(`  ${config.interface}:`)
-    body.push(`    dhcp4: true`)
+    body.push(`  ethernets:`)
+    body.push(`    ${config.interface}:`)
+    body.push(`      dhcp4: true`)
     if (dnsList.length > 0) {
-      body.push(`    nameservers:`)
-      body.push(`      addresses:`)
-      for (const d of dnsList) body.push(`        - ${d}`)
+      body.push(`      nameservers:`)
+      body.push(`        addresses:`)
+      for (const d of dnsList) body.push(`          - ${d}`)
     }
   } else if (config.configType === 'bond') {
     const slaves = String(config.bondSlaves || '').split(',').map((s) => s.trim()).filter(Boolean)