enhance: refined project structure

index.html

package-lock.json

package.json

quaternions.html

src/bezier/CubicBezierCurve2d.ts

src/bezier/Curve2d.ts

src/main.ts

src/quaternion/Quaternion.ts

src/quaternion/RotationObject.ts

src/uitls/Interfaces.ts

src/uitls/rendering.ts

src/uitls/ui.ts

src/vite-env.d.ts