Optimize archive structure

We want to improve both security and performance by optimizing data structure of archive file,
this includes:

- [ ] Sanity check based on checksum and/or some magic number
- [ ] Use array instead of linked list for better cache behavior

首先定位封存格式的實作和目前的鏈結串列資料結構。定義校驗和或魔術數字驗證，並將以陣列為基礎的配置與現有結構進行比較；完成的標準是封存檔已通過合理性檢查，且修改後的配置改善了快取行為，同時不損害安全性。

由索引模型根據 Issue 內容生成。