feat: Add Raydium AMM V4 support and middleware system

- Add Raydium AMM V4 trading protocol support
- Implement instruction middleware system for dynamic processing
- Refactor trade executors to support middleware parameters
- Add fee calculation and slippage protection mechanisms
- Maintain backward compatibility with optional middleware

src/constants/mod.rs

@@ -4,6 +4,7 @@ pub mod pumpswap;
 pub mod swqos;
 pub mod trade;
 pub mod raydium_cpmm;
+pub mod raydium_amm_v4;
 pub mod decimals;
 
 pub mod trade_platform {

src/constants/raydium_amm_v4.rs

@@ -0,0 +1,33 @@
+//! Constants used by the crate.
+//!
+//! This module contains various constants used throughout the crate, including:
+//!
+//! - Seeds for deriving Program Derived Addresses (PDAs)
+//! - Program account addresses and public keys
+//!
+//! The constants are organized into submodules for better organization:
+//!
+//! - `seeds`: Contains seed values used for PDA derivation
+//! - `accounts`: Contains important program account addresses
+
+/// Constants used as seeds for deriving PDAs (Program Derived Addresses)
+pub mod seeds {
+    pub const POOL_SEED: &[u8] = b"pool";
+}
+
+/// Constants related to program accounts and authorities
+pub mod accounts {
+    use solana_sdk::{pubkey, pubkey::Pubkey};
+    pub const AUTHORITY: Pubkey = pubkey!("5Q544fKrFoe6tsEbD7S8EmxGTJYAKtTVhAW5Q5pge4j1");
+    pub const TOKEN_PROGRAM: Pubkey = spl_token::ID;
+    pub const WSOL_TOKEN_ACCOUNT: Pubkey = pubkey!("So11111111111111111111111111111111111111112");
+    pub const RAYDIUM_AMM_V4: Pubkey = pubkey!("675kPX9MHTjS2zt1qfr1NYHuzeLXfQM9H24wFSUt1Mp8");
+
+    pub const TRADE_FEE_NUMERATOR: u64 = 25;
+    pub const TRADE_FEE_DENOMINATOR: u64 = 10000;
+    pub const SWAP_FEE_NUMERATOR: u64 = 25;
+    pub const SWAP_FEE_DENOMINATOR: u64 = 10000;
+}
+
+pub const SWAP_BASE_IN_DISCRIMINATOR: &[u8] = &[9];
+pub const SWAP_BASE_OUT_DISCRIMINATOR: &[u8] = &[11];