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

examples/org-chart/classic.html

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+<!doctype html>
+<html lang="ko">
+<head>
+  <meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1">
+  <title>HM OrgChart · 직접 열기 예제</title>
+  <link rel="icon" href="data:,">
+  <link rel="stylesheet" href="./assets/hm-theme.css"><link rel="stylesheet" href="./demo.css">
+</head>
+<body>
+  <main>
+    <h1>OrgChart Core · 직접 열기 예제</h1>
+    <p>가상 JSON을 Classic 번들로 실행합니다. file://에서 외부 JSON Fetch는 사용하지 않습니다.</p>
+    <div class="demo-controls" aria-label="Core 실행 예제">
+      <button id="reload" type="button">초기 JSON 재로드</button>
+      <button id="update" type="button">직원 이동·추가 반영</button>
+      <button id="destroy" type="button">인스턴스 정리</button>
+      <button id="recreate" type="button">새 인스턴스 생성</button>
+    </div>
+    <p id="status" role="status" aria-live="polite">준비 중</p><div id="chart-host"></div>
+  </main>
+  <script src="./assets/orgchart.browser.js"></script><script src="./fixtures.js"></script>
+  <script src="./app-classic.js"></script>
+  <script>startDemo(window.HMOrgChart, window.OrgChartFixtures);</script>
+</body>
+</html>