Function isPointInPolygon

isPointInPolygon(point: Position, polygon: readonly Position[]): boolean
Check if a point is inside a polygon using ray-casting algorithm

Korean: 점-다각형 내부 확인 (Point-in-Polygon Test)

Uses the ray-casting algorithm to determine if a point is inside a polygon. Casts a ray from the point to infinity and counts boundary crossings. Odd number of crossings = inside, even number = outside.
Parameters
- point: Position
  Position to test
- polygon: readonly Position[]
  Array of positions defining polygon vertices
Returns boolean
true if point is inside polygon, false otherwise
Example
```
const polygon = [
  { x: 0, y: 0 },
  { x: 10, y: 0 },
  { x: 10, y: 10 },
  { x: 0, y: 10 }
];
const inside = isPointInPolygon({ x: 5, y: 5 }, polygon); // true
const outside = isPointInPolygon({ x: 15, y: 5 }, polygon); // false
```
- Defined in systems/vitalpoint/KoreanAnatomy.ts:1127