refactor: slim solver to card_game-native types

Per Rhys: card_game's solver is the real engine, so drop the redundant
adapter types in solitaire_data::solver rather than maintain a parallel
verdict/config/move vocabulary.

- Delete SolverResult, SolverConfig, SolverMove, and snapshot_to_solver_move.
  The verdict now reads straight off card_game's return:
    Ok(Some(instr)) = winnable (first move on the path)
    Ok(None)        = provably unwinnable
    Err(_)          = inconclusive (budget exceeded)
- SolveOutcome is now Result<Option<KlondikeInstruction>, SolveError>.
- try_solve / try_solve_from_state take plain (moves_budget, states_budget)
  u64s; add DEFAULT_SOLVE_{MOVES,STATES}_BUDGET consts.
- snapshot_to_solver_move duplicated core's GameState::instruction_to_move,
  so make that pub and have the hint convert the first-move instruction to
  highlighted (from, to) piles through it. Re-export KlondikeInstruction
  from solitaire_core.
- HintSolverConfig now holds { moves_budget, states_budget } instead of
  wrapping the deleted SolverConfig.
- Update consumers: pending_hint, play_by_seed (verdict badge), game_plugin
  (choose_winnable_seed), input_plugin, hud_plugin, and the gen_seeds /
  gen_difficulty_seeds asset tools.

solver.rs drops 274 -> 140 lines. cargo test --workspace and
cargo clippy --workspace --all-targets -- -D warnings pass.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

solitaire_engine/src/hud_plugin.rs

@@ -1159,7 +1159,7 @@ fn handle_hint_button(
             return;
         }
         if let (Some(cfg), Some(hint)) = (solver_config.as_ref(), pending_hint.as_mut()) {
-            hint.spawn(g.0.clone(), cfg.0);
+            hint.spawn(g.0.clone(), cfg.moves_budget, cfg.states_budget);
         }
     }
 }