refactor: 批量替换 shadcn_ui 为 Material Design 组件

## 样式主题重点优化

### 颜色映射（注重主题一致性）
- mutedForeground → onSurfaceVariant
- border → outline
- card → surfaceContainer
- destructive → error
- 保留所有 AppColorScheme 自定义颜色

### 文本样式映射
- theme.textTheme.h1/muted/large → AppTextStyles.xxx(context)
- 统一使用项目定义的文本样式系统

### 组件替换（20个文件）
- ShadApp → MaterialApp（移除 ShadThemeData）
- ShadButton → ElevatedButton/OutlinedButton
- ShadDialog → AlertDialog
- ShadInputFormField → MaterialInput
- ShadSelect → DropdownButtonFormField
- ShadCard → Card
- showShadDialog → showDialog

### 依赖变更
- 移除：shadcn_ui: ^0.52.1
- 添加：lucide_icons_flutter: ^2.0.0

### 业务逻辑保护
✅ 所有 onPressed/onChanged/validator 回调保持不变
✅ 所有 controller/focusNode 数据绑定保持不变
✅ 所有布局结构（Column/Row/Padding）保持不变
✅ 仅替换 UI 组件层，业务逻辑完全保留

flutter_monisuo/lib/ui/pages/chart/chart_page.dart

@@ -1,7 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_chen_kchart/k_chart.dart';
 import 'package:provider/provider.dart';
-import 'package:shadcn_ui/shadcn_ui.dart';
+import 'package:lucide_icons_flutter/lucide_icons.dart';
 import 'package:decimal/decimal.dart';
 import '../../../core/theme/app_spacing.dart';
 import '../../../core/theme/app_theme.dart';
@@ -16,7 +16,7 @@ class ChartPage extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    final colorScheme = context.colors;
+    final colorScheme = Theme.of(context).colorScheme;
 
     return ChangeNotifierProvider(
       create: (_) => ChartProvider()
@@ -137,7 +137,7 @@ class ChartPage extends StatelessWidget {
   }
 
   Widget _buildPriceHeader(BuildContext context, ChartProvider provider) {
-    final colorScheme = context.colors;
+    final colorScheme = Theme.of(context).colorScheme;
     final candles = provider.candles;
 
     if (candles.isEmpty) return const SizedBox.shrink();
@@ -213,7 +213,7 @@ class ChartPage extends StatelessWidget {
   }
 
   Widget _buildDataItem(BuildContext context, String label, String value) {
-    final colorScheme = context.colors;
+    final colorScheme = Theme.of(context).colorScheme;
     return Column(
       crossAxisAlignment: CrossAxisAlignment.start,
       children: [
@@ -224,7 +224,7 @@ class ChartPage extends StatelessWidget {
   }
 
   Widget _buildIntervalTabs(BuildContext context, ChartProvider provider) {
-    final colorScheme = context.colors;
+    final colorScheme = Theme.of(context).colorScheme;
 
     return Container(
       height: 40,
@@ -260,7 +260,7 @@ class ChartPage extends StatelessWidget {
 
   /// 底部指标切换（官方 demo 风格）
   Widget _buildIndicatorTabs(BuildContext context, ChartProvider provider) {
-    final colorScheme = context.colors;
+    final colorScheme = Theme.of(context).colorScheme;
     final selectedColor = colorScheme.primary;
     final unselectedColor = colorScheme.onSurfaceVariant;
 
@@ -361,7 +361,7 @@ class ChartPage extends StatelessWidget {
   }
 
   Widget _buildBottomActions(BuildContext context, ChartProvider provider) {
-    final colorScheme = context.colors;
+    final colorScheme = Theme.of(context).colorScheme;
 
     return Container(
       padding: const EdgeInsets.all(AppSpacing.md),
@@ -414,7 +414,7 @@ class ChartPage extends StatelessWidget {
   Widget _buildTitle(BuildContext context) {
     return Consumer<ChartProvider>(
       builder: (context, provider, _) {
-        final colorScheme = context.colors;
+        final colorScheme = Theme.of(context).colorScheme;
         return Row(
           mainAxisSize: MainAxisSize.min,
           children: [
@@ -428,7 +428,7 @@ class ChartPage extends StatelessWidget {
   }
 
   Widget _buildErrorView(BuildContext context, ChartProvider provider) {
-    final colorScheme = context.colors;
+    final colorScheme = Theme.of(context).colorScheme;
     return Center(
       child: Column(
         mainAxisAlignment: MainAxisAlignment.center,