Add comprehensive CLI options for game settings

- Expanded `Cli` with arguments for username, game mode, map size, perk
  deck, resources, supply limit, XP modifier, and skill points limit.
- Enabled the `cli` module in `lib.rs` and activated argument parsing in
  `main.rs`.
- Added placeholder (commented) fields to `App` for future configuration
  integration.

src/main.rs

@@ -6,11 +6,11 @@ use std::{
 };
 use war_in_tunnels::{
     app::{App, Event, handle_input_events},
-    // cli::{Cli, get_args},
+    cli::{Cli, get_args},
 };
 
 fn main() -> Result<()> {
-    // let args: Cli = get_args();
+    let args: Cli = get_args();
     let mut terminal: Terminal<CrosstermBackend<Stdout>> = ratatui::init();
     let mut app: App = App { exit: false };