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- scoring.rs (152 lines) — scoring fns superseded by KlondikeAdapter; move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_core/src/lib.rs

@@ -1,9 +1,7 @@
 pub mod achievement;
 pub mod card;
-pub mod deck;
 pub mod error;
 pub mod game_state;
 pub mod klondike_adapter;
 pub mod pile;
-pub mod scoring;
 pub mod solver;