Add Crypto Vault plugin

[MeSun424]

添加 Crypto Vault AstrBot 插件。仓库：https://github.com/MeSun424/astrbot_plugin_crypto_vault；版本 1.0，支持图片可逆混淆、跨群安全图库、私聊解密和贡献排行榜。

Summary by Sourcery

New Features:

• Add the Crypto Vault AstrBot plugin for reversible image obfuscation, cross-group secure image sharing, private-message decryption, and contributor rankings.

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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