OSError: libGL.so not found while running embed mode in ManimGL

### Describe the error
I am encountering an `OSError` when trying to run a ManimGL script in embed mode. The error indicates that the `libGL.so` file cannot be found, which prevents the code from executing properly.

### Code and Error
**Code**:
```python
from manimlib import *

class Def(InteractiveScene):
def construct(self):
self.embed()
color = Square()
self.play(
Write(color), run_time=1
)
t = TexText("Requested Square")
t.set_color_by_gradient([BLUE, YELLOW_A])
self.add(t)
self.wait(2)
```

**Error**:
```
OSError: libGL.so: cannot open shared object file: No such file or directory
```

### Environment
**OS System**: Ubuntu on Termux (Android)
**manim version**: master
**python version**: 3.13

在 Ubuntu/Termux 上以 embed mode 執行 ManimGL 時發生此錯誤，表示缺少 OpenGL 函式庫。首先檢查系統圖形驅動程式安裝情況及 libGL.so 的可用性。查看 manimlib 中的 embed mode 初始化程式碼，瞭解它如何載入 OpenGL。透過安裝必要的圖形庫（例如 libgl1-mesa-glx）並重新測試腳本來驗證修復。

由索引模型根據 Issue 內容生成。