feat(android): add Flutter WebView app with Docker release builds

.gitignore

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+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.build/
+.buildlog/
+.history/
+.svn/
+.swiftpm/
+migrate_working_dir/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# VS Code local state
+.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+**/ios/Flutter/.last_build_id
+.dart_tool/
+.flutter-plugins-dependencies
+.pub-cache/
+.pub/
+/build/
+/coverage/
+
+# Symbolication related
+app.*.symbols
+
+# Obfuscation related
+app.*.map.json
+
+# Android Studio will place build artifacts here
+/android/app/debug
+/android/app/profile
+/android/app/release
+
+# Widget Preview related
+.widget_preview/
+
+# ---------------------------------------------------------------------------
+# 以下为 DSH 工作台项目补充规则
+
+# Gradle caches and build outputs (all modules)
+.gradle/
+.kotlin/
+build/
+out/
+
+# Android SDK paths and native build intermediates
+local.properties
+.cxx/
+.externalNativeBuild/
+captures/
+
+# Generated Android packages
+*.apk
+*.aab
+*.ap_
+*.dex
+
+# Signing keys and local credentials
+*.jks
+*.keystore
+*.p12
+*.pfx
+keystore.properties
+signing.properties
+.env
+.env.*
+!.env.example
+!.env.sample
+
+# OS metadata (already listed above, kept for clarity)
+Thumbs.db
+Desktop.ini
+
+# Local agent/browser tooling
+.mimocode/
+.playwright-cli/
+
+# Dependencies and caches left by the web branch
+node_modules/
+.vite/
+
+# Keep the Gradle Wrapper in version control
+!gradle/wrapper/gradle-wrapper.jar
+!gradle/wrapper/gradle-wrapper.properties