style: 完成前端专业金融风格优化

- 主题配色: 黑金传奇(暗) + 白金殿堂(亮)
- 底部导航: 去掉毛玻璃，简洁专业
- 交易页面: 明亮模式颜色优化，实心按钮
- 按钮圆角: xxl(24px) → lg(12px)/md(8px)
- 字体系统: Inter(币安同款)
- 整体风格: 专业金融科技

flutter_monisuo/lib/ui/pages/asset/asset_page.dart

@@ -578,7 +578,7 @@ void _showDepositDialog(BuildContext context) {
     builder: (ctx) => Dialog(
       backgroundColor: Colors.transparent,
       child: GlassPanel(
-        borderRadius: BorderRadius.circular(AppRadius.xxl),
+        borderRadius: BorderRadius.circular(AppRadius.lg),
         padding: EdgeInsets.all(AppSpacing.lg),
         child: Column(
           mainAxisSize: MainAxisSize.min,
@@ -692,7 +692,7 @@ void _showDepositResultDialog(BuildContext context, Map<String, dynamic> data) {
     builder: (ctx) => Dialog(
       backgroundColor: Colors.transparent,
       child: GlassPanel(
-        borderRadius: BorderRadius.circular(AppRadius.xxl),
+        borderRadius: BorderRadius.circular(AppRadius.lg),
         padding: EdgeInsets.all(AppSpacing.lg),
         child: Column(
           mainAxisSize: MainAxisSize.min,
@@ -917,7 +917,7 @@ void _showWithdrawDialog(BuildContext context, String? balance) {
     builder: (ctx) => Dialog(
       backgroundColor: Colors.transparent,
       child: GlassPanel(
-        borderRadius: BorderRadius.circular(AppRadius.xxl),
+        borderRadius: BorderRadius.circular(AppRadius.lg),
         padding: EdgeInsets.all(AppSpacing.lg),
         child: SingleChildScrollView(
           child: Column(
@@ -1113,7 +1113,7 @@ void _showResultDialog(BuildContext context, String title, String? message) {
     builder: (ctx) => Dialog(
       backgroundColor: Colors.transparent,
       child: GlassPanel(
-        borderRadius: BorderRadius.circular(AppRadius.xxl),
+        borderRadius: BorderRadius.circular(AppRadius.lg),
         padding: EdgeInsets.all(AppSpacing.lg),
         child: Column(
           mainAxisSize: MainAxisSize.min,
@@ -1156,7 +1156,7 @@ void _showKycRequiredDialog(BuildContext context) {
     builder: (ctx) => Dialog(
       backgroundColor: Colors.transparent,
       child: GlassPanel(
-        borderRadius: BorderRadius.circular(AppRadius.xxl),
+        borderRadius: BorderRadius.circular(AppRadius.lg),
         padding: EdgeInsets.all(AppSpacing.lg),
         child: Column(
           mainAxisSize: MainAxisSize.min,