feat: integrate Raydium CPMM trading protocol support

- Add Raydium CPMM constants, instruction builder and pool implementation
- Implement unified buy/sell trading interface and event parsing system
- Update documentation and examples to support new protocol

src/constants/mod.rs

@@ -3,9 +3,11 @@ pub mod pumpfun;
 pub mod pumpswap;
 pub mod swqos;
 pub mod trade;
+pub mod raydium_cpmm;
 
 pub mod trade_platform {
     pub const PUMPFUN: &'static str = "pumpfun";
     pub const PUMPFUN_SWAP: &'static str = "pumpswap";
     pub const BONK: &'static str = "bonk";
+    pub const RAYDIUM_CPMM: &'static str = "raydium_cpmm";
 }

src/constants/raydium_cpmm.rs

@@ -0,0 +1,31 @@
+//! 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";
+    pub const POOL_VAULT_SEED: &[u8] = b"pool_vault";
+    pub const OBSERVATION_STATE_SEED: &[u8] = b"observation";
+}
+
+/// Constants related to program accounts and authorities
+pub mod accounts {
+    use solana_sdk::{pubkey, pubkey::Pubkey};
+    pub const AUTHORITY: Pubkey = pubkey!("GpMZbSM2GgvTKHJirzeGfMFoaZ8UR2X7F4v8vHTvxFbL");
+    pub const AMM_CONFIG: Pubkey = pubkey!("D4FPEruKEHrG5TenZ2mpDGEfu1iUvTiqBxvpU8HLBvC2");
+    pub const TOKEN_PROGRAM: Pubkey = pubkey!("TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA");
+    pub const WSOL_TOKEN_ACCOUNT: Pubkey = pubkey!("So11111111111111111111111111111111111111112");
+    pub const RAYDIUM_CPMM: Pubkey = pubkey!("CPMMoo8L3F4NbTegBCKVNunggL7H1ZpdTHKxQB5qKP1C");
+}
+
+pub const SWAP_BASE_IN_DISCRIMINATOR: &[u8] = &[143, 190, 90, 218, 196, 30, 51, 222];
+pub const SWAP_BASE_OUT_DISCRIMINATOR: &[u8] = &[55, 217, 98, 86, 163, 74, 180, 173];