feat(terminal): add hey-intern LLM-powered shell command generator

Add a new shell function that uses an LLM API to generate shell commands
from natural language queries. The command displays the generated command
for user confirmation before execution and adds it to history.

- Generates shell commands from natural language via LLM
- Displays command for user review before execution
- Automatically adds executed commands to bash history
- Uses qwen3-coder-next-80b-instruct model

modules/home/programs/terminal/bash/default.nix

@@ -47,6 +47,8 @@ in
         fi
 
         [[ -f ~/.bash_custom ]] && . ~/.bash_custom
+
+        source ${./config/hey-intern.sh}
       '';
     };