feat(saju): 사주풀이 5 컴포넌트 + useSajuReading hook

src/pages/saju/hooks/useSajuReading.js

@@ -0,0 +1,33 @@
+import { useState, useEffect } from 'react';
+import { sajuGetReading } from '../../../api';
+
+export default function useSajuReading(readingId) {
+  const [data, setData] = useState(null);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState(null);
+
+  useEffect(() => {
+    if (!readingId) {
+      setLoading(false);
+      return;
+    }
+    let cancelled = false;
+    setLoading(true);
+    sajuGetReading(readingId)
+      .then((d) => {
+        if (!cancelled) {
+          setData(d);
+          setLoading(false);
+        }
+      })
+      .catch((e) => {
+        if (!cancelled) {
+          setError(e.message || '사주 결과를 불러올 수 없습니다.');
+          setLoading(false);
+        }
+      });
+    return () => { cancelled = true; };
+  }, [readingId]);
+
+  return { data, loading, error };
+}