feat(est-test): 품셈 보기와 품셈자료 붙여넣기

- 원본 BookData 7권 해독(DBISAM 암호 표 Blowfish-CBC, zlib RTF) 서버 book-store.cjs, /api/book 경로
- 목차 트리·본문 표·제목/본문/키워드 검색·본문 강조·복사하기, 단가산출·내역·일위·기계 붙여넣기

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tools/est-test/index.html

@@ -65,6 +65,7 @@
     <script defer src="native-jdl-compare.js"></script>
     <script defer src="native-global-vars.js"></script>
     <script defer src="native-new-estimate.js"></script>
+    <script defer src="native-book.js"></script>
     <script defer src="native-wonga-tools.js"></script>
     <script defer src="native-estimate-print.js"></script>
     <script defer src="native-xml-check.js"></script>
@@ -298,6 +299,8 @@
         ><button id="unit-calc-btn" data-action="unit-calc" hidden>단위환산</button
         ><button id="sources-btn" data-action="sources" hidden title="발췌근거 삭제,삽입 및 변경">발췌근거</button
         ><button id="uses-search-btn" data-action="uses-data-search">사용위치</button
+        ><button data-action="book">품셈</button
+        ><button data-action="book-paste">품셈자료 붙여넣기</button
         ><button data-action="add-row">행 추가</button><button data-action="copy-row">복사</button
         ><button data-action="paste-row">붙여넣기</button
         ><button data-action="delete-row">삭제</button