/api/v1/user/me 세션 시각을 추가하고 userfront 대시보드 Unknown 세션 시간 문제 수정

userfront/lib/features/profile/data/models/user_profile_model.dart

@@ -33,6 +33,7 @@ class UserProfile {
   final String department;
   final String affiliationType;
   final String companyCode;
+  final String? sessionAuthenticatedAt;
   final Map<String, dynamic>? metadata;
   final Tenant? tenant;
 
@@ -44,6 +45,7 @@ class UserProfile {
     required this.department,
     required this.affiliationType,
     required this.companyCode,
+    this.sessionAuthenticatedAt,
     this.metadata,
     this.tenant,
   });
@@ -57,6 +59,7 @@ class UserProfile {
       department: json['department'] ?? '',
       affiliationType: json['affiliationType'] ?? '',
       companyCode: json['companyCode'] ?? '',
+      sessionAuthenticatedAt: json['sessionAuthenticatedAt'] as String?,
       metadata: json['metadata'] != null
           ? Map<String, dynamic>.from(json['metadata'])
           : null,
@@ -73,6 +76,7 @@ class UserProfile {
       'department': department,
       'affiliationType': affiliationType,
       'companyCode': companyCode,
+      'sessionAuthenticatedAt': sessionAuthenticatedAt,
       'metadata': metadata,
       'tenant': tenant?.toJson(),
     };
@@ -87,6 +91,7 @@ class UserProfile {
       department: department ?? this.department,
       affiliationType: affiliationType,
       companyCode: companyCode,
+      sessionAuthenticatedAt: sessionAuthenticatedAt,
       tenant: tenant,
     );
   }