manim not able to parse z type in SVG path

I am using the `circuitikz` library in LateX to draw some circuits and animate using manim. I encountered problems with some components as they were showing incomplete in manim. The SVG file generated is correct and is showing all the components correctly.

I did some further digging and found out that manim is not recognizing the `z (close path)` type in the SVG file. This is making some of the diagrams incomplete in manim. The svg parser cannot read the `z` path type.

查看 manim 中的 SVG 解析程式碼，可能在類似 `svg_parser.py` 或 `svg_paths.py` 的模組中。找出處理路徑指令（M、L、C 等）的位置，並為 'z'（close path）指令新增支援。透過使用 circuitikz 建立一個帶有閉合路徑的 SVG 來測試，並驗證它在 manim 中正確渲染。檢查現有的 SVG 解析測試，了解如何新增新的測試案例。

由索引模型根據 Issue 內容生成。