Polygon 无法正确计算非简单多边形（有自交）的面积
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Description
无法正确计算非简单多边形（有自交）的面积
```python
from cyaron import *
p = Polygon(
[(-3, 4), (1.5, 3), (-6, -2), (-3, -4)]
)
print(p.area()) # output: 3.0
```
如图，显然面积为 $15$。
即使这种情形在应用时不常见，是否应在文档中警告，或者在代码逻辑中加入判断？
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Research direction
Reproduce the example by calling Polygon.area() with the provided self-intersecting points, then inspect the Polygon.area() entry point and its existing tests, if any. Define the intended behavior for self-intersecting polygons and document or implement that decision; done means the behavior is explicit and the example is covered.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- tooling
- Issue type
- Bug
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100