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- scoring.rs (152 lines) — scoring fns superseded by KlondikeAdapter; move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

@@ -1,8 +1,7 @@
 use crate::card::{Card, Rank};
 use crate::error::MoveError;
-use crate::klondike_adapter::{card_from_kl, KlondikeAdapter, SavedInstruction};
+use crate::klondike_adapter::{card_from_kl, compute_time_bonus as scoring_time_bonus, KlondikeAdapter, SavedInstruction};
 use crate::pile::{Pile, PileType};
-use crate::scoring::compute_time_bonus as scoring_time_bonus;
 use card_game::{Game, Session, SessionConfig};
 use klondike::{
     DstFoundation, DstTableau, Foundation, Klondike, KlondikeConfig, KlondikeInstruction,