refactor(core): unify Suit/Rank with card_game upstream types

Replace the parallel solitaire_core::Suit and solitaire_core::Rank
definitions with pub-use re-exports from card_game. card_game upstream
gained serde, is_black(), and value() to make this clean.

- card.rs: remove Suit/Rank enums and impls; add pub use card_game::{Suit,Rank}
- klondike_adapter.rs: remove From<card_game::Suit/Rank> bridges (now same type)
- Simplify card_from_kl: .into() calls become direct assignment
- Cargo.toml: switch to git deps (serde feature), Cargo.lock updated

All 62 solitaire_core tests pass; clippy clean.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Cargo.toml

@@ -38,8 +38,8 @@ solitaire_core   = { path = "solitaire_core" }
 solitaire_sync   = { path = "solitaire_sync" }
 solitaire_data   = { path = "solitaire_data" }
 solitaire_engine = { path = "solitaire_engine" }
-klondike         = { version = "0.3.0", registry = "Quaternions" }
-card_game        = { version = "0.4.0", registry = "Quaternions" }
+klondike         = { git = "https://git.aleshym.co/Quaternions/card_game" }
+card_game        = { git = "https://git.aleshym.co/Quaternions/card_game", features = ["serde"] }
 
 # Bevy with `default-features = false` to avoid the unused
 # `bevy_audio → rodio + symphonia + cpal 0.15 + alsa 0.9` chain.