refactor: extract TradingClient façade to client/mod.rs

refactor: split trading/core/params into per-protocol modules + dex_swap
build: crate-type rlib only (drop unused cdylib)

Co-authored-by: Cursor <cursoragent@cursor.com>

src/trading/core/params/mod.rs

@@ -0,0 +1,17 @@
+//! DEX protocol parameter types and [`SwapParams`].
+
+mod bonk;
+mod dex_swap;
+mod meteora_damm_v2;
+mod pumpfun;
+mod pumpswap;
+mod raydium_amm_v4;
+mod raydium_cpmm;
+
+pub use bonk::BonkParams;
+pub use dex_swap::{DexParamEnum, SenderConcurrencyConfig, SwapParams};
+pub use meteora_damm_v2::MeteoraDammV2Params;
+pub use pumpfun::PumpFunParams;
+pub use pumpswap::PumpSwapParams;
+pub use raydium_amm_v4::RaydiumAmmV4Params;
+pub use raydium_cpmm::RaydiumCpmmParams;