chore(core): delete deck.rs and scoring.rs

- deck.rs (193 lines) — Deck/deal_klondike replaced by Klondike::with_seed()
- scoring.rs (152 lines) — scoring fns superseded by KlondikeAdapter; move
  compute_time_bonus to klondike_adapter.rs, update win_summary_plugin import
- Remove rand dep from solitaire_core (only used by deck.rs)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

solitaire_engine/src/win_summary_plugin.rs

@@ -12,7 +12,7 @@
 
 use bevy::prelude::*;
 use solitaire_core::game_state::GameMode;
-use solitaire_core::scoring::compute_time_bonus;
+use solitaire_core::klondike_adapter::compute_time_bonus;
 use solitaire_data::AnimSpeed;
 
 use crate::achievement_plugin::display_name_for;