Refactor code structure for improved readability and maintainability

lib/multiDomainClient.test.js

@@ -1,6 +1,11 @@
 import { describe, it, expect } from 'vitest';
 import { getStateInfoClient } from '@/lib/getStateInfoClient';
-import { buildCanonicalUrl, buildCanonicalPath, normalizeHost } from '@/lib/getCanonicalUrl';
+import {
+    buildCanonicalUrl,
+    buildCanonicalPath,
+    buildMainCanonicalUrl,
+    normalizeHost,
+} from '@/lib/getCanonicalUrl';
 
 function setLocation(loc) {
     Object.defineProperty(window, 'location', { value: loc, writable: true, configurable: true });
@@ -56,3 +61,18 @@ describe('buildCanonicalUrl (self-canonical per-host)', () => {
         expect(buildCanonicalUrl(null, '/x')).toBe('https://nobat724.com/x');
     });
 });
+
+describe('buildMainCanonicalUrl (canonical متادیتا → دامنه‌ی اصلی)', () => {
+    it('هر مسیری → همان مسیر روی nobat724.com', () => {
+        expect(buildMainCanonicalUrl('/doctors')).toBe('https://nobat724.com/doctors');
+        expect(buildMainCanonicalUrl('/doctor/abc-123')).toBe('https://nobat724.com/doctor/abc-123');
+    });
+
+    it('ریشه → با trailing slash', () => {
+        expect(buildMainCanonicalUrl('/')).toBe('https://nobat724.com/');
+    });
+
+    it('query و trailing slash حذف می‌شوند', () => {
+        expect(buildMainCanonicalUrl('/doctors/?specialty=قلب')).toBe('https://nobat724.com/doctors');
+    });
+});