feat(saju): HoryungMascot + SajuNav 공통 컴포넌트

src/pages/saju/components/HoryungMascot.jsx

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+import React from 'react';
+
+const POSE_TO_FILE = {
+  front: '/images/saju/horyung/horyung-front.png',
+  bust: '/images/saju/horyung/horyung-bust.png',
+  greeting: '/images/saju/horyung/horyung-greeting.png',
+  thinking: '/images/saju/horyung/horyung-thinking.png',
+  pointing: '/images/saju/horyung/horyung-pointing.png',
+  happy: '/images/saju/horyung/horyung-happy.png',
+};
+
+export default function HoryungMascot({ pose = 'front', size = 'lg', className = '' }) {
+  const src = POSE_TO_FILE[pose] || POSE_TO_FILE.front;
+  return (
+    <img
+      src={src}
+      alt="호령"
+      className={`horyung-mascot horyung-mascot--${size} ${className}`}
+      onError={(e) => { e.target.style.visibility = 'hidden'; }}
+    />
+  );
+}

src/pages/saju/components/SajuNav.jsx

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+import React from 'react';
+import { Link, NavLink } from 'react-router-dom';
+
+export default function SajuNav() {
+  return (
+    <nav className="saju-nav" aria-label="호령 사주">
+      <Link to="/saju" className="saju-nav__logo">호령사주</Link>
+      <ul className="saju-nav__links">
+        <li><NavLink to="/saju/today">오늘의 운세</NavLink></li>
+        <li><NavLink to="/saju/compatibility">궁합보기</NavLink></li>
+        <li><NavLink to="/saju/result">사주풀이</NavLink></li>
+      </ul>
+      <Link to="/saju" className="saju-nav__cta">사주풀이 시작하기</Link>
+    </nav>
+  );
+}