[Bug] Background video not playing as expected on AstroDX 2.0.0 Beta 6 Patch 2

### ⠀

- [x] This issue is not duplicated with any other open or closed issues

### Describe the bug

I checked that all the settings items about background videos in the game are set correctly and play the level after the game is played. But the background video did not appear.

### Expected behavior

The background video appears normally in the background of the level.


### Steps to reproduce

1. Download and install AstroDX 2.0.0 Beta6 Patch2 version;
2. Open the game;
3. Play a level containing background video.

### Device information

Device: Xiaomi Pad 7 Ultra (25032RP42C)
System: HyperOS 3.0.0.8 Beta (Based on Android 16)
Version: AstroDX 2.0.0 Beta 6 Patch 2


### Screenshots



### Additional context

_No response_

这个 issue 是关于在 Android 平台的 Unity 游戏 AstroDX 中的背景视频播放。首先检查 Unity 中的视频播放器组件和渲染管线。查看关卡加载和背景视频初始化代码。验证 Android 特定的视频编解码器支持和权限。请在 Android 设备上测试以复现该问题。

由索引模型根据 Issue 内容生成。