feat: add staff and user authentication APIs with request handling

app/routes/_admin.lg-admin.tsx

@@ -1,7 +1,26 @@
 import { Outlet } from 'react-router'
 
+import { getStaff } from '~/apis/admin/get-staff'
 import { AdminProvider } from '~/contexts/admin'
 import { AdminDefaultLayout } from '~/layouts/admin/default'
+import { handleCookie } from '~/libs/cookies'
+
+import type { Route } from './+types/_admin.lg-admin'
+
+export const loader = async ({ request }: Route.LoaderArgs) => {
+  const { adminToken } = await handleCookie(request)
+  let adminData
+  if (adminToken) {
+    const { data } = await getStaff({
+      accessToken: adminToken,
+    })
+    adminData = data
+  }
+
+  return {
+    adminData,
+  }
+}
 
 const AdminLayout = () => {
   return (