[Discussion] Self-Hosted Manager Binary

> [!IMPORTANT]
> This is a discussion about what to do moving forward. Feel free to comment, or just vote using 👍 / 👎 / any emoji you think best.

### Problem Statement

Currently the install script is running in Bash, which is both hard to read, hard to write and hard to maintain. We should do something about it.

### Solution Brainstorm

Currently the Bash scripts handles everything: install, backup, restore, upgrade, config generation, cleanup.... so many things, so much unreadable code. Burak (@BYK) asked me a few months back, "What do you think of rewriting the `install.sh` into Go or Bun, and package it into single binary?". At first, yes it would disrupt how upgrades are currently being done (using `git fetch`, `git checkout ...`), but other than that, I think anything other than Bash would be great.

There is also Amber language (https://amber-lang.com/), which transpile to Bash. Still early, not big of a community.

Start by reading the existing install.sh and mapping the install, backup, restore, upgrade, config-generation, and cleanup responsibilities it handles. Compare the proposed Go or Bun binary direction with the current git fetch and git checkout upgrade flow; done requires an agreed implementation path and scope, since this issue is still a discussion.

Written by the indexing model from the issue text.