nix does not build opencode2 which is why there is actually no tui in v2

### Description

Now nix only collects opencode that can be used for the server, etc.  But opencode2 is not going to out

### Plugins


### OpenCode version

v2

### Steps to reproduce

nix build
ls ./result/bin

### Screenshot and/or share link

_No response_

### Operating System

NixOS Unstable

### Terminal

Ghostty