feat(org-chart): add core cards and fixed-layout integration

examples/org-chart-react/p1.html

@@ -0,0 +1,5 @@
+<!doctype html>
+<html lang="ko">
+<head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1"><title>HM OrgChart P1 · React Full Composition</title><link rel="icon" href="data:,"></head>
+<body><main><div id="root"></div></main><script type="module" src="./p1.tsx"></script></body>
+</html>