fix: resolve NextAuth UntrustedHost error and add login debugging

- Add trustHost: true to NextAuth configuration
- Add console logging for login debugging
- Fix authentication issues preventing login redirect

src/app/admin/login/page.tsx

@@ -44,18 +44,24 @@ function LoginForm() {
     setLoading(true);
 
     try {
+      console.log('开始登录...', { email, callbackUrl });
       const result = await signIn('credentials', {
         email,
         password,
         redirect: false,
       });
 
+      console.log('登录结果:', result);
+
       if (result?.error) {
+        console.error('登录错误:', result.error);
         setError('邮箱或密码错误');
       } else {
+        console.log('登录成功，准备跳转到:', callbackUrl);
         router.push(callbackUrl);
       }
     } catch (err) {
+      console.error('登录异常:', err);
       setError('登录失败，请稍后重试');
     } finally {
       setLoading(false);