admin page add

frontend/lib/core/services/auth_proxy_service.dart

@@ -99,6 +99,50 @@ class AuthProxyService {
     }
   }
 
+  static Future<bool> checkAdminAuth(String adminPassword) async {
+    final url = Uri.parse('$_baseUrl/api/v1/admin/check');
+    try {
+      final response = await http.get(
+        url,
+        headers: {
+          'Content-Type': 'application/json',
+          'X-Admin-Password': adminPassword,
+        },
+      );
+      return response.statusCode == 200;
+    } catch (_) {
+      return false;
+    }
+  }
+
+  static Future<void> createUser({
+    required String loginId,
+    required String adminPassword,
+    String? email,
+    String? phone,
+    String? displayName,
+  }) async {
+    final url = Uri.parse('$_baseUrl/api/v1/admin/users');
+    
+    final response = await http.post(
+      url,
+      headers: {
+        'Content-Type': 'application/json',
+        'X-Admin-Password': adminPassword,
+      },
+      body: jsonEncode({
+        'loginId': loginId,
+        'email': email,
+        'phone': phone,
+        'displayName': displayName,
+      }),
+    );
+
+    if (response.statusCode != 200) {
+      throw Exception('Failed to create user: ${response.body}');
+    }
+  }
+
   static Future<void> sendLog(String level, String message, {Map<String, dynamic>? data}) async {
     final url = Uri.parse('$_baseUrl/api/v1/client-log');
     try {