[Feature]: Flathub / flatpak isolated installer and app manager

## Summary

flatpak and flathub are awesome to manage apps in a linux environment.
a bit like docker they can isolate most feature in a safe app environment
while managing conflicts and etc.

well it s not important because ofc you got UV and a one liner installer
+ the project is a webapp.

So it s worth noting so i share the idea if anyone got interested.

## Component(s) Affected

- [ ] Core / Backend (app, agents, config, providers, utils, local_models)
- [ ] Console (frontend web UI)
- [ ] Channels (DingTalk, Feishu, QQ, Discord, iMessage, etc.)
- [ ] Skills
- [ ] CLI
- [ ] Documentation (website)
- [ ] Tests
- [x] CI/CD
- [x] Scripts / Deploy

## Problem / Motivation

it s just a nice feature, a side distribution channel getting popular and a safer security practice
(except compared to docker ofc)

it could help for few drivers maybe or memory system, things like that maybe also to distribute addon within a uniform environment / channel

could also make the update system more natural for end user.

not important, worth noting.