开发:暴露Circle到Api

src/api.ts

@@ -1,5 +1,6 @@
 export * from "./DatabaseServices/CADFiler";
 export * from "./DatabaseServices/Entity/Arc";
+export * from "./DatabaseServices/Entity/Circle";
 export * from "./DatabaseServices/Entity/Line";
 export * from "./DatabaseServices/Entity/Polyline";
 export * from "./GraphicsSystem/BoolOperateUtils";