新增管理員頁面、Word PDF 預覽、租賃日期欄位、SSL docker-compose

- 新增 /admin.html：上傳/刪除範本，HTTP Basic Auth 保護
- Word 預覽改用 LibreOffice PDF 轉換，帶入表單參數即時顯示
- 新增租賃開始/結束年月日、租期年數佔位符支援
- 預覽 loading 遮罩，修正 hidden 被 CSS display:flex 覆蓋的問題
- 左右欄 UI 重構，右欄固定顯示 Word 預覽
- 新增 docker-compose.yml + nginx SSL reverse proxy
- admin 密碼改由 ADMIN_PASSWORD 環境變數設定

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package-lock.json

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