fix: ServerForm 缺少 ssh_key/credential_id 字段, selIds.has→includes

frontend/src/components/server/ServerManager.tsx

@@ -268,6 +268,8 @@ export function ServerManager() {
       username: server.username || 'root',
       auth_type: server.auth_type || 'password',
       password: '',
+      ssh_key: '',
+      credential_id: null as number | null,
       os: server.os || '',
       cpu: String(server.cpu || ''),
       memory: server.memory ? String(Math.round(server.memory / 1024)) : '', // MB → GB