Termius-beta: init at 9.9.0

[Rishik-Y]

Note: This is a continued PR for #367897, I am just a newbie who doesn't know how to remove some of the commits, as per @drupol's instructions, so here is a new PR 😝

Package Information

• Package name: Termius-beta
• Latest released version: 9.9.0
• Current version on the unstable channel: none
• Current version on the stable/release channel: none

Notification for Termius Maintainer:
@Br1ght0ne @Th0rgal
Hi, I have utilized code from Termius and modified it for Termius-beta to work, and as far as testing goes Termius-beta works completely fine.
Since the code is very similar, i have kept both of you as Maintainers for Termius-beta as well.
If you don't want to be maintainer for this code, its completely fine just do notify me 🤗

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 25.05 Release Notes (or backporting 24.11 and 25.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[Rishik-Y]

Hi @drupol, could you review the content of the nix file now?