feat: 添加 Flutter Web 构建产物

- 更新 .gitignore 允许 flutter_monisuo/build/web 目录
- 添加 Flutter Web release 构建文件

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

.gitignore

@@ -1,5 +1,6 @@
 # Compiled class file
 *.class
+*.pyc
 
 # Log file
 *.log
@@ -62,6 +63,39 @@ application-local.yml
 *.njsproj
 *.sln
 *.sw?
+*.swp
 
 # Build stats
 stats.html
+
+# Miscellaneous
+.atom/
+.build/
+.buildlog/
+.history
+.svn/
+.swiftpm/
+migrate_working_dir/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+**/ios/Flutter/.last_build_id
+.dart_tool/
+.flutter-plugins-dependencies
+.pub-cache/
+.pub/
+/build/
+/coverage/
+**/build/
+!flutter_monisuo/build/web/
+
+# 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