Add native touch rotation to FlyByCamera

[Copilot]

Android FlyByCamera rotation previously depended on emulated mouse events. With mouse emulation disabled by default, touch drag no longer rotates the camera.

• Touch input

  • Register a TouchTrigger in FlyByCamera.
  • Handle touch MOVE events directly through TouchListener.

• Rotation behavior

  • Convert touch deltas using the existing mouse-equivalent scale.
  • Preserve inverted-Y behavior.
  • Allow touch dragging when dragToRotate is enabled.

flyCam.onTouch("FLYCAM_Touch",
        new TouchEvent(TouchEvent.Type.MOVE, 0f, 0f, 128f, 0f), 0f);

• Fixes Android: Mouse and Keyboard are no longer emulated by default in 3.10.0 #2929