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/screens/ble_provision_screen.dart

@@ -262,7 +262,7 @@ class _BleProvisionScreenState extends State<BleProvisionScreen> {
               width: double.infinity,
               padding: const EdgeInsets.all(12),
               decoration: BoxDecoration(
-                color: Colors.black.withOpacity(0.18),
+                color: Colors.black.withValues(alpha: 0.18),
                 borderRadius: BorderRadius.circular(12),
                 border: Border.all(color: Colors.white12),
               ),
@@ -440,7 +440,7 @@ class _ProgressCard extends StatelessWidget {
             decoration: BoxDecoration(
               color: step.active
                   ? const Color(0x1A22C55E)
-                  : Colors.black.withOpacity(0.14),
+                  : Colors.black.withValues(alpha: 0.14),
               borderRadius: BorderRadius.circular(999),
               border: Border.all(
                 color: step.active ? const Color(0xFF22C55E) : Colors.white24,
@@ -531,7 +531,7 @@ class _SignalBadge extends StatelessWidget {
     return Container(
       padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 8),
       decoration: BoxDecoration(
-        color: Colors.black.withOpacity(0.2),
+        color: Colors.black.withValues(alpha: 0.2),
         borderRadius: BorderRadius.circular(12),
       ),
       child: Row(
@@ -569,7 +569,7 @@ class _EmptyState extends StatelessWidget {
       width: double.infinity,
       padding: const EdgeInsets.all(20),
       decoration: BoxDecoration(
-        color: Colors.black.withOpacity(0.15),
+        color: Colors.black.withValues(alpha: 0.15),
         borderRadius: BorderRadius.circular(16),
         border: Border.all(color: Colors.white10),
       ),