Implement `patchwise --config` TUI configuration interface

[davidgantman]

Description:
Provide an interactive, terminal-based menu-driven configuration interface for PatchWise.

• Add CLI flag --config that launches a curses/ncurses-style hierarchical configuration TUI.

• While inside the configuration editor interface, the user should see the merged config state (default_config.yaml values overlaid with user_config.yaml values, for any user_config.yaml values that exist, if any):

  • default_config.yaml should remain read-only.
  • Any selections made by the user should be applied in the user_config.yaml file.

• Support editing:

  • Strings
  • Booleans
  • Integers
  • Lists

• Ensure that the display reflects exactly what will be used at runtime.

• Design the interface so kernel engineers familiar with menuconfig feel at home.

[ethanreidel]

I can work on this.