feat: 重构认证页面使用 AuthPageScaffold 组件

apps/lib/features/auth/ui/screens/register_screen.dart

@@ -12,6 +12,7 @@ import '../../../../shared/widgets/toast/toast.dart';
 import '../../../../shared/widgets/toast/toast_type.dart';
 import '../../presentation/cubits/register_cubit.dart';
 import '../../data/auth_repository.dart';
+import '../widgets/auth_page_scaffold.dart';
 
 class RegisterScreen extends StatelessWidget {
   const RegisterScreen({super.key});
@@ -79,35 +80,19 @@ class _RegisterViewState extends State<RegisterView> {
 
   @override
   Widget build(BuildContext context) {
-    return Scaffold(
-      backgroundColor: AppColors.background,
-      body: SafeArea(
-        child: Padding(
-          padding: const EdgeInsets.symmetric(horizontal: 24),
-          child: Column(
-            crossAxisAlignment: CrossAxisAlignment.center,
-            children: [
-              Expanded(
-                child: Center(
-                  child: Column(
-                    mainAxisSize: MainAxisSize.min,
-                    crossAxisAlignment: CrossAxisAlignment.center,
-                    children: [
-                      _buildAppIcon(),
-                      const SizedBox(height: 24),
-                      _buildAppTitle(),
-                      const SizedBox(height: 24),
-                      _buildFormContainer(),
-                    ],
-                  ),
-                ),
-              ),
-              _buildFooter(),
-              const SizedBox(height: 24),
-            ],
-          ),
-        ),
+    return AuthPageScaffold(
+      mainContent: Column(
+        mainAxisSize: MainAxisSize.min,
+        crossAxisAlignment: CrossAxisAlignment.center,
+        children: [
+          _buildAppIcon(),
+          const SizedBox(height: 24),
+          _buildAppTitle(),
+          const SizedBox(height: 24),
+          _buildFormContainer(),
+        ],
       ),
+      footer: _buildFooter(),
     );
   }
 
@@ -202,7 +187,7 @@ class _RegisterViewState extends State<RegisterView> {
           style: const TextStyle(
             fontSize: 13,
             fontWeight: FontWeight.w500,
-            color: Color(0xFF475569),
+            color: AppColors.slate600,
           ),
         ),
         const SizedBox(height: 6),
@@ -223,7 +208,7 @@ class _RegisterViewState extends State<RegisterView> {
           style: TextStyle(
             fontSize: 13,
             fontWeight: FontWeight.w500,
-            color: Color(0xFF475569),
+            color: AppColors.slate600,
           ),
         ),
         const SizedBox(height: 6),