fix(typescript): Refactor types and interfaces to use consistent I prefix and update related tests

test/test.smartproxy.ts

@@ -282,10 +282,20 @@ tap.test('should support optional source IP preservation in chained proxies', as
 // Test round-robin behavior for multiple target hosts in a domain config.
 tap.test('should use round robin for multiple target hosts in domain config', async () => {
   // Create a domain config with multiple hosts in the target
-  const domainConfig = {
+  const domainConfig: {
+    domains: string[];
+    forwarding: {
+      type: 'http-only';
+      target: {
+        host: string[];
+        port: number;
+      };
+      http: { enabled: boolean };
+    }
+  } = {
     domains: ['rr.test'],
     forwarding: {
-      type: 'http-only',
+      type: 'http-only' as const,
       target: {
         host: ['hostA', 'hostB'], // Array of hosts for round-robin
         port: 80