style(theme): 客户端切换深色视觉风格

lib/pages/create/create_view.dart

@@ -13,8 +13,8 @@ const double _arrowSize = 36;
 const double _illustrationWidth = 156;
 const double _illustrationHeight = 88;
 const double _mottoLineWidth = 96;
-const List<Color> _aiGradientStart = [Color(0xFFFFE3D0), Color(0xFFFFC9AC)];
-const List<Color> _uploadGradient = [Color(0xFFFFEAD9), Color(0xFFFFD3B3)];
+const List<Color> _aiGradientStart = [AppColors.raised, AppColors.goldCard];
+const List<Color> _uploadGradient = [AppColors.card, AppColors.raised];
 
 /// 创作页：AI 制作与上传发布两张主卡，底部品牌标语。
 class CreatePage extends StatelessWidget {
@@ -24,7 +24,7 @@ class CreatePage extends StatelessWidget {
   Widget build(BuildContext context) {
     final l10n = AppLocalizations.of(context)!;
     return Theme(
-      data: AppTheme.light(),
+      data: AppTheme.dark(),
       child: SafeArea(
         bottom: false,
         child: ListView(
@@ -131,7 +131,7 @@ class _CreateCard extends StatelessWidget {
         boxShadow: const [AppTheme.cardShadow],
       ),
       child: Material(
-        color: Colors.transparent,
+        color: AppColors.transparent,
         borderRadius: BorderRadius.circular(_cardRadius),
         clipBehavior: Clip.antiAlias,
         child: InkWell(
@@ -296,7 +296,7 @@ class _UploadIllustration extends StatelessWidget {
               width: 30,
               height: 20,
               decoration: BoxDecoration(
-                color: Colors.white.withValues(alpha: 0.55),
+                color: AppColors.onSurface.withValues(alpha: 0.12),
                 borderRadius: BorderRadius.circular(4),
               ),
               child: const Icon(