feat: add schema to ask command

feat: add cat command

refactor(chat): remove unused imports

Removed the unused imports "encoding/json" and "log" from the chat.go file. This cleanup improves code readability and reduces unnecessary dependencies.

refactor(backend): add initialization method for askCmd struct

Introduces an `init` method in the `askCmd` struct to handle setup logic, improving code readability and separation of concerns. The method checks if standard input is attached and sets the `Once` flag accordingly.

ref: remove unused module

fix: fix bug where config was being overwritten by env var

ref: remove default value for temperature

feat: change the way we parse chat files to allow for no space betwee…

…n --- and user/system/assistant

feat: change default model to gpt-4o-mini

feat: add hlp config env flag