feat: Improve gateway handling in ServerManager by enforcing validation for jumphost and exit server types, ensuring at least one primary gateway is specified during server addition and updates.

frontend/src/ServerManager.jsx

@@ -223,7 +223,8 @@ function ServerManager() {
       provider: '', 
       tunnel: 'GRE',
       type: 'jumphost',
-      gateway: ''
+      gateway: '',
+      gateways: [makeGateway({ primary: true })],
     });
   };
 
@@ -244,7 +245,8 @@ function ServerManager() {
       provider: '', 
       tunnel: 'GRE',
       type: 'jumphost',
-      gateway: ''
+      gateway: '',
+      gateways: [makeGateway({ primary: true })],
     });
     setCustomProvider('');
     setError('');
@@ -277,11 +279,20 @@ function ServerManager() {
     // Используем customProvider если выбран "Другой"
     const finalProvider = newServer.provider === 'Другой' ? customProvider : newServer.provider;
     const nextId = `srv-${servers.length + 1}`;
+    const normalizedGws = NEEDS_GATEWAYS(newServer.type)
+      ? normalizeGateways(newServer.gateways, newServer.gateway || newServer.dns || newServer.ip)
+      : [];
+    if (NEEDS_GATEWAYS(newServer.type) && (!normalizedGws || normalizedGws.length === 0)) {
+      setError('Для jumphost/exit добавьте хотя бы один gateway и отметьте основной.');
+      return;
+    }
+
     const serverToAdd = { 
       ...newServer, 
       provider: finalProvider,
       id: newServer.id || nextId,
       type: normalizeServerType(newServer.type),
+      gateways: normalizedGws,
     };
     
     setServers([...servers, serverToAdd]);
@@ -319,6 +330,10 @@ function ServerManager() {
       type: normalizeServerType(updatedServer.type),
       gateways: NEEDS_GATEWAYS(updatedServer.type) ? normalizeGateways(updatedServer.gateways, updatedServer.gateway || updatedServer.dns || updatedServer.ip) : [],
     };
+    if (NEEDS_GATEWAYS(normalizedServer.type) && normalizedServer.gateways.length === 0) {
+      setError('Для jumphost/exit необходим хотя бы один gateway с признаком основного.');
+      return;
+    }
     setServers(servers.map(s => {
       const sameId = s.id && updatedServer.id ? s.id === updatedServer.id : false;
       const sameIp = s.ip === updatedServer.ip;