fix: mpp 性能优化和修复

- mjpeg-->h265 mpp 编码速度优化
- 修复 mpp 编码后的视频 rustdesk 无法解码问题
- 更新版本号为 v0.1.2

src/video/stream_manager.rs

@@ -794,6 +794,11 @@ impl VideoStreamManager {
         self.webrtc_streamer.set_bitrate_preset(preset).await
     }
 
+    /// Request a keyframe from the shared video pipeline
+    pub async fn request_keyframe(&self) -> crate::error::Result<()> {
+        self.webrtc_streamer.request_keyframe().await
+    }
+
     /// Publish event to event bus
     async fn publish_event(&self, event: SystemEvent) {
         if let Some(ref events) = *self.events.read().await {