Better encryption and easier database test

### The required feature described as a wish

As a user I would like to have better encryption and, above all, to be able to perform quick tests without the complexity of setting up traditional databases, so I think it would be a good idea to implement JWT and SQLite in Cloudstack.

JWT could be implemented to improve the way in which users like me or applications access the API, as it uses user/password credentials, as well as a token that expires according to a stipulated time. JWT would be very easy to implement in Cloudstack.

SQLite does not require a dedicated server, which would make Cloudstack less resource-intensive and easier to configure, as well as allowing for rapid prototyping and testing.

尚未確定任何原始碼檔案、測試或進入點。首先應釐清 JWT 驗證和 SQLite 支援是否都在範圍內；要完成工作，需要為每項提議的功能制定明確的需求並進行驗證。

由索引模型根據 Issue 內容生成。