feat(streaming): 添加自编码串流模式切换功能

webrtc_controller_flutter/lib/proto/control_message.pb.dart

@@ -39,6 +39,7 @@ class ControlMessage extends $pb.GeneratedMessage {
     $core.int? width,
     $core.int? height,
     $core.int? fps,
+    $core.int? streamMode,
   }) {
     final result = create();
     if (action != null) result.action = action;
@@ -55,6 +56,7 @@ class ControlMessage extends $pb.GeneratedMessage {
     if (width != null) result.width = width;
     if (height != null) result.height = height;
     if (fps != null) result.fps = fps;
+    if (streamMode != null) result.streamMode = streamMode;
     return result;
   }
 
@@ -86,6 +88,7 @@ class ControlMessage extends $pb.GeneratedMessage {
     ..aI(12, _omitFieldNames ? '' : 'width')
     ..aI(13, _omitFieldNames ? '' : 'height')
     ..aI(14, _omitFieldNames ? '' : 'fps')
+    ..aI(15, _omitFieldNames ? '' : 'stream_mode')
     ..hasRequiredFields = false;
 
   @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
@@ -240,6 +243,17 @@ class ControlMessage extends $pb.GeneratedMessage {
   $core.bool hasFps() => $_has(13);
   @$pb.TagNumber(14)
   void clearFps() => $_clearField(14);
+
+  /// 串流模式（SET_STREAM_MODE / REPORT_STREAM_MODE）：
+  /// 0 = WebRTC 全托管；1 = 自编码（自建 MediaCodec 编解码 + video DataChannel）
+  @$pb.TagNumber(15)
+  $core.int get streamMode => $_getIZ(14);
+  @$pb.TagNumber(15)
+  set streamMode($core.int value) => $_setSignedInt32(14, value);
+  @$pb.TagNumber(15)
+  $core.bool hasStreamMode() => $_has(14);
+  @$pb.TagNumber(15)
+  void clearStreamMode() => $_clearField(15);
 }
 
 const $core.bool _omitFieldNames =