feat: Flutter APK 编译成功 + Gradle 配置修复 + APK 下载部署 + 待优化清单

- 通过 qemu-user-static 实现 ARM64 主机编译 Android APK (51MB)
- 修复 Gradle: Aliyun 镜像 + PREFER_SETTINGS + JVM 内存 1536M
- 部署 APK 到 configs/downloads/, Web 下载接口已验证 (HTTP 200)
- 新增 Flutter TODO.md: 10项待优化 (P0/P1/P2 分级)
- 新增 pm_soul.md, 更新 routes.rs APK 下载路由

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

clients/flutter/lib/theme/app_theme.dart

@@ -21,8 +21,8 @@ class AppTheme {
       colorScheme: colorScheme,
       scaffoldBackgroundColor: AppColors.background,
       canvasColor: AppColors.background,
-      splashColor: AppColors.primary.withOpacity(0.12),
-      highlightColor: AppColors.primary.withOpacity(0.08),
+      splashColor: AppColors.primary.withValues(alpha: 0.12),
+      highlightColor: AppColors.primary.withValues(alpha: 0.08),
       dividerColor: AppColors.border,
       cardColor: AppColors.card,
       fontFamily: 'Noto Sans SC',
@@ -43,7 +43,7 @@ class AppTheme {
       cardTheme: CardThemeData(
         color: AppColors.card,
         elevation: 6,
-        shadowColor: Colors.black.withOpacity(0.20),
+        shadowColor: Colors.black.withValues(alpha: 0.20),
         margin: EdgeInsets.zero,
         shape: RoundedRectangleBorder(
           borderRadius: BorderRadius.circular(AppRadius.large),
@@ -70,7 +70,7 @@ class AppTheme {
       navigationBarTheme: NavigationBarThemeData(
         backgroundColor: AppColors.card,
         height: 64,
-        indicatorColor: AppColors.primary.withOpacity(0.18),
+        indicatorColor: AppColors.primary.withValues(alpha: 0.18),
         labelTextStyle: WidgetStateProperty.all(
           const TextStyle(
             fontSize: 12,
@@ -123,7 +123,7 @@ class AppTheme {
         ),
         trackColor: WidgetStateProperty.resolveWith(
           (states) => states.contains(WidgetState.selected)
-              ? AppColors.primary.withOpacity(0.4)
+              ? AppColors.primary.withValues(alpha: 0.4)
               : AppColors.border,
         ),
       ),