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/android/settings.gradle

@@ -10,6 +10,9 @@ pluginManagement {
     includeBuild("$flutterSdkPath/packages/flutter_tools/gradle")
 
     repositories {
+        maven { url 'https://maven.aliyun.com/repository/gradle-plugin' }
+        maven { url 'https://maven.aliyun.com/repository/google' }
+        maven { url 'https://maven.aliyun.com/repository/central' }
         google()
         mavenCentral()
         gradlePluginPortal()
@@ -22,4 +25,15 @@ plugins {
     id 'org.jetbrains.kotlin.android' version '1.9.22' apply false
 }
 
+dependencyResolutionManagement {
+    repositoriesMode.set(RepositoriesMode.PREFER_SETTINGS)
+    repositories {
+        maven { url 'https://maven.aliyun.com/repository/google' }
+        maven { url 'https://maven.aliyun.com/repository/central' }
+        maven { url 'https://storage.googleapis.com/download.flutter.io' }
+        google()
+        mavenCentral()
+    }
+}
+
 include ':app'