feat: Centralize authentication redirects to middleware, remove client-side redirect logic, and refine logout process.

src/app/(auth)/login/page.tsx

@@ -4,6 +4,7 @@ import { useState } from 'react';
 import { useRouter } from 'next/navigation';
 import { signIn } from 'next-auth/react';
 import Link from 'next/link';
+import { resetLogoutState } from '@/services/api';
 
 export default function LoginPage() {
   const router = useRouter();
@@ -13,9 +14,12 @@ export default function LoginPage() {
   const [error, setError] = useState('');
   const [loading, setLoading] = useState(false);
 
-  // Safety net: clear logout flag when login page loads
+  // Safety net: clear logout flags when login page loads.
+  // This resets both the localStorage flag and the module-level flag in api.ts
+  // so the API interceptor stops blocking requests.
   if (typeof window !== 'undefined') {
     localStorage.removeItem('isLoggingOut');
+    resetLogoutState();
   }
 
   const handleSubmit = async (e: React.FormEvent) => {