fix architecture and write new tests

apps/admin/src/app/dashboard/site-config/page.tsx

@@ -183,15 +183,14 @@ export default function AdminSiteConfigPage() {
 
   useEffect(() => {
     async function fetchData() {
-      const token = localStorage.getItem('admin_token')
       try {
         const [companiesRes, homepageRes] = await Promise.all([
           fetch(`${ADMIN_API_BASE}/admin/companies`, {
-            headers: token ? { Authorization: `Bearer ${token}` } : {},
+            credentials: 'include',
             cache: 'no-store',
           }),
           fetch(`${ADMIN_API_BASE}/admin/site-config/marketplace-homepage`, {
-            headers: token ? { Authorization: `Bearer ${token}` } : {},
+            credentials: 'include',
             cache: 'no-store',
           }),
         ])
@@ -276,15 +275,13 @@ export default function AdminSiteConfigPage() {
   async function saveHomepage() {
     setHomepageSaving(true)
     setHomepageMessage(null)
-    const token = localStorage.getItem('admin_token')
-
     try {
       const res = await fetch(`${ADMIN_API_BASE}/admin/site-config/marketplace-homepage`, {
         method: 'PATCH',
         headers: {
           'Content-Type': 'application/json',
-          ...(token ? { Authorization: `Bearer ${token}` } : {}),
         },
+        credentials: 'include',
         body: JSON.stringify({ homepage }),
       })
       const json = await res.json()