refactor(apps): 主题系统迁移至 ColorScheme + 扩展架构并支持 Dark Mode

apps/lib/shared/widgets/app_toggle_switch.dart

@@ -22,6 +22,7 @@ class AppToggleSwitch extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    final colorScheme = Theme.of(context).colorScheme;
     return GestureDetector(
       onTap: onChanged == null ? null : () => onChanged!(!value),
       child: Opacity(
@@ -32,13 +33,13 @@ class AppToggleSwitch extends StatelessWidget {
           padding: const EdgeInsets.all(AppSpacing.xs / 2),
           decoration: BoxDecoration(
             color: value
-                ? (activeBackgroundColor ?? AppColors.blue100)
-                : (inactiveBackgroundColor ?? AppColors.surfaceTertiary),
+                ? (activeBackgroundColor ?? colorScheme.primaryContainer)
+                : (inactiveBackgroundColor ?? colorScheme.tertiaryContainer),
             borderRadius: BorderRadius.circular(AppRadius.full),
             border: Border.all(
               color: value
-                  ? (activeBorderColor ?? AppColors.blue300)
-                  : (inactiveBorderColor ?? AppColors.borderSecondary),
+                  ? (activeBorderColor ?? colorScheme.tertiary)
+                  : (inactiveBorderColor ?? colorScheme.outlineVariant),
             ),
           ),
           child: AnimatedAlign(
@@ -48,9 +49,9 @@ class AppToggleSwitch extends StatelessWidget {
               width: AppSpacing.lg + AppSpacing.xs,
               height: AppSpacing.lg + AppSpacing.xs,
               decoration: BoxDecoration(
-                color: AppColors.white,
+                color: colorScheme.surface,
                 borderRadius: BorderRadius.circular(AppRadius.full),
-                border: Border.all(color: AppColors.borderSecondary),
+                border: Border.all(color: colorScheme.outlineVariant),
               ),
             ),
           ),