feat: implement SSH algorithms mapping and refactor cipher usage acro…

[Chakyiu]

…ss SSH modules

Overview

Short summary of what this PR does

• Added: src/backend/utils/ssh-algorithms.ts with a SSH_ALGORITHMS constant whose cipher list is filtered at module load time by ssh2.
• Fixed: chacha20-poly1305@openssh.com get excluded from the support list. Instead it maps to 'chacha20'.

Changes Made

ssh2 builds its supported cipher list at startup using crypto.getCiphers(). It maps 'chacha20-poly1305@openssh.com' to the OpenSSL name 'chacha20'. In Electron's bundled Node.js, 'chacha20' isn't in crypto.getCiphers() (unlike the system Node.js used in dev mode), so chacha20-poly1305@openssh.com gets excluded from the supported list.

Related Issues

None

Screenshots / Demos

Open in Server Stats Error

4:50:56 PM Starting metrics collection
4:50:56 PM Resolving DNS for nowservice.cc
4:50:56 PM Connecting to xxx.com:22
4:50:56 PM Initiating SSH handshake
4:50:56 PM Authenticating with SSH key
4:50:56 PM Failed to start metrics: Unsupported algorithm: chacha20-poly1305@openssh.com

Checklist

• Code follows project style guidelines
• [] Supports mobile and desktop UI/app (if applicable)
• I have read Contributing.md
• This is not a translation request. See docs

[Impaler67]

I got this issue and cannot connect to any of my servers. Any shortcuts?