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/raydium_cpmm.rs

@@ -0,0 +1,89 @@
+use crate::common::SolanaRpcClient;
+use solana_sdk::pubkey::Pubkey;
+
+/// RaydiumCpmm protocol specific parameters
+/// Configuration parameters specific to Raydium CPMM trading protocol
+#[derive(Clone)]
+pub struct RaydiumCpmmParams {
+    /// Pool address
+    pub pool_state: Pubkey,
+    /// Amm config address
+    pub amm_config: Pubkey,
+    /// Base token mint address
+    pub base_mint: Pubkey,
+    /// Quote token mint address
+    pub quote_mint: Pubkey,
+    /// Base token reserve amount in the pool
+    pub base_reserve: u64,
+    /// Quote token reserve amount in the pool
+    pub quote_reserve: u64,
+    /// Base token vault address
+    pub base_vault: Pubkey,
+    /// Quote token vault address
+    pub quote_vault: Pubkey,
+    /// Base token program ID
+    pub base_token_program: Pubkey,
+    /// Quote token program ID
+    pub quote_token_program: Pubkey,
+    /// Observation state account
+    pub observation_state: Pubkey,
+}
+
+impl RaydiumCpmmParams {
+    pub fn from_trade(
+        pool_state: Pubkey,
+        amm_config: Pubkey,
+        input_token_mint: Pubkey,
+        output_token_mint: Pubkey,
+        input_vault: Pubkey,
+        output_vault: Pubkey,
+        input_token_program: Pubkey,
+        output_token_program: Pubkey,
+        observation_state: Pubkey,
+        base_reserve: u64,
+        quote_reserve: u64,
+    ) -> Self {
+        Self {
+            pool_state: pool_state,
+            amm_config: amm_config,
+            base_mint: input_token_mint,
+            quote_mint: output_token_mint,
+            base_reserve: base_reserve,
+            quote_reserve: quote_reserve,
+            base_vault: input_vault,
+            quote_vault: output_vault,
+            base_token_program: input_token_program,
+            quote_token_program: output_token_program,
+            observation_state: observation_state,
+        }
+    }
+
+    pub async fn from_pool_address_by_rpc(
+        rpc: &SolanaRpcClient,
+        pool_address: &Pubkey,
+    ) -> Result<Self, anyhow::Error> {
+        let pool =
+            crate::instruction::utils::raydium_cpmm::fetch_pool_state(rpc, pool_address).await?;
+        let (token0_balance, token1_balance) =
+            crate::instruction::utils::raydium_cpmm::get_pool_token_balances(
+                rpc,
+                pool_address,
+                &pool.token0_mint,
+                &pool.token1_mint,
+            )
+            .await?;
+        Ok(Self {
+            pool_state: *pool_address,
+            amm_config: pool.amm_config,
+            base_mint: pool.token0_mint,
+            quote_mint: pool.token1_mint,
+            base_reserve: token0_balance,
+            quote_reserve: token1_balance,
+            base_vault: pool.token0_vault,
+            quote_vault: pool.token1_vault,
+            base_token_program: pool.token0_program,
+            quote_token_program: pool.token1_program,
+            observation_state: pool.observation_key,
+        })
+    }
+}