fix(windows): 修复TTS插件回调触发空指针和资源泄漏问题 - #648
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重构了Windows平台TTS插件的完成回调逻辑，使用临界区保护speakResult指针，统一管理等待句柄的注册与反注册，避免重复注册导致的资源泄漏以及回调访问已销毁对象引发的崩溃。同时在stop方法中主动完成未完成的语音合成任务，防止Dart侧永久等待。
仅更新应用版本号，进行版本迭代
1. 修复MediaEnded回调中未重置speakResult导致的内存访问问题 2. 增加pVoice空指针检查，避免调用无效语音实例崩溃 3. 优化COM初始化逻辑，兼容已初始化COM的线程环境 4. 修复语音枚举流程中的资源泄漏和错误处理逻辑 5. 完善停止、暂停、继续播放等操作的空指针安全检查
仅更新了pubspec.yaml中的版本号，发布小版本更新
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重构了Windows平台TTS插件的完成回调逻辑，使用临界区保护speakResult指针，统一管理等待句柄的注册与反注册，避免重复注册导致的资源泄漏以及回调访问已销毁对象引发的崩溃。同时在stop方法中主动完成未完成的语音合成任务，防止Dart侧永久等待。