feat: Implement gateway management in FilterManager, adding functionality for creating, updating, and validating gateways, enhancing server configuration capabilities and user experience.

backend/routes/serverConfigsRoutes.js

@@ -14,6 +14,24 @@ const serverConfigsListRoutes = createJsonDataRoutes('server-configs.json', (ser
   if (!server.id || !server.name) {
     return `Server at index ${i} is missing required fields`;
   }
+  if (server.gateways !== undefined) {
+    if (!Array.isArray(server.gateways)) {
+      return `Server at index ${i} has invalid gateways (must be array)`;
+    }
+    if (server.gateways.length === 0) {
+      return `Server at index ${i} must have at least one gateway`;
+    }
+    const defaults = server.gateways.filter(g => g && g.primary);
+    if (defaults.length !== 1) {
+      return `Server at index ${i} must have exactly one primary gateway`;
+    }
+    for (let j = 0; j < server.gateways.length; j++) {
+      const gw = server.gateways[j] || {};
+      if (!gw.name || String(gw.name).trim().length === 0) {
+        return `Server at index ${i} gateway at index ${j} is missing name`;
+      }
+    }
+  }
   return null;
 });