feat: Introduce fe modular build system

fe-app-podkop/src/validators/validateDns.ts

@@ -0,0 +1,23 @@
+import { validateDomain } from './validateDomain';
+import { validateIPV4 } from './validateIp';
+import { ValidationResult } from './types.js';
+
+export function validateDNS(value: string): ValidationResult {
+  if (!value) {
+    return { valid: false, message: 'DNS server address cannot be empty' };
+  }
+
+  if (validateIPV4(value).valid) {
+    return { valid: true, message: 'Valid' };
+  }
+
+  if (validateDomain(value).valid) {
+    return { valid: true, message: 'Valid' };
+  }
+
+  return {
+    valid: false,
+    message:
+      'Invalid DNS server format. Examples: 8.8.8.8 or dns.example.com or dns.example.com/nicedns for DoH',
+  };
+}