fix: 시나리오별 장비 매매 품목 범위를 보존

현재 시나리오 allItems를 API 선택지와 턴 실행 검증에 함께 적용한다. 빈 설정은 Ref 기본 장비 24종으로 복원하고 명시된 비급 시나리오는 기존 품목을 유지한다.

packages/logic/test/legacyUniqueItemPool.test.ts

@@ -1,6 +1,9 @@
 import { describe, expect, it } from 'vitest';
 
-import { resolveLegacyCompatibleUniqueConfig } from '../src/rewards/legacyUniqueItemPool.js';
+import {
+    resolveLegacyCompatibleUniqueConfig,
+    resolveLegacyPurchasableItemKeys,
+} from '../src/rewards/legacyUniqueItemPool.js';
 
 describe('legacy-compatible unique item pool', () => {
     it.each([undefined, {}, '{}'] as const)('restores the Ref default pool when allItems is %j', async (allItems) => {
@@ -27,4 +30,29 @@ describe('legacy-compatible unique item pool', () => {
             },
         });
     });
+
+    it.each([undefined, {}, '{}'] as const)('restores the Ref default shop items when allItems is %j', (allItems) => {
+        const keys = resolveLegacyPurchasableItemKeys(allItems === undefined ? {} : { allItems });
+
+        expect(keys.size).toBe(24);
+        expect(keys.has('che_명마_01_노기')).toBe(true);
+        expect(keys.has('che_치료_환약')).toBe(true);
+        expect(keys.has('event_전투특기_격노')).toBe(false);
+    });
+
+    it('uses only non-limited entries from an explicit scenario shop pool', () => {
+        const keys = resolveLegacyPurchasableItemKeys({
+            allItems: {
+                weapon: {
+                    che_무기_01_단도: 0,
+                    che_무기_12_칠성검: 2,
+                },
+                item: {
+                    event_전투특기_격노: 0,
+                },
+            },
+        });
+
+        expect([...keys]).toEqual(['che_무기_01_단도', 'event_전투특기_격노']);
+    });
 });