Stabilizza live YouTube/RTMP e fix crash rotazione mobile.

Pipeline YouTube con relay, overlay e publisher sync lato backend; fix GL pauseGlDuringRotation su Android per evitare crash in rotazione durante lo streaming Flutter.

Co-authored-by: Cursor <cursoragent@cursor.com>

mobile/lib/platform/streaming_channel.dart

@@ -19,32 +19,53 @@ class StreamingChannel {
     return ok ?? false;
   }
 
+  /// Dopo rotazione: riallinea preview/stream senza fermare RTMP.
+  static Future<void> syncOrientation() async {
+    await _channel.invokeMethod<void>('syncOrientation');
+  }
+
   static Future<void> stopPreview() async {
     await _channel.invokeMethod('stopPreview');
   }
 
   static Future<void> startStream({
     required String rtmpUrl,
-    int targetBitrate = 2500000,
+    int targetBitrate = 3000000,
     int targetFps = 30,
+    int width = 1280,
+    int height = 720,
+    bool portrait = false,
+    int rotation = 0,
   }) async {
     await _channel.invokeMethod('startStream', {
       'rtmpUrl': rtmpUrl,
       'videoBitrate': targetBitrate,
       'fps': targetFps,
+      'width': width,
+      'height': height,
+      'portrait': portrait,
+      'rotation': rotation,
     });
   }
 
   /// Ripresa dopo pausa: resetta stati RTMP residui (CONNECTING/RECONNECTING).
   static Future<void> resumeStream({
     required String rtmpUrl,
-    int targetBitrate = 2500000,
+    int targetBitrate = 3000000,
     int targetFps = 30,
+    int width = 1280,
+    int height = 720,
+    bool portrait = false,
+    int rotation = 0,
   }) async {
     await _channel.invokeMethod('resumeStream', {
       'rtmpUrl': rtmpUrl,
       'videoBitrate': targetBitrate,
       'fps': targetFps,
+      'width': width,
+      'height': height,
+      'portrait': portrait,
+      'rotation': rotation,
     });
   }