feat: PumpFun & PumpSwap Cashback support

- Sync IDL from pump-public-docs into idl/
- Add is_cashback_coin to BondingCurve and Pool
- Pump sell: append UserVolumeAccumulator as remaining account when cashback coin
- PumpSwap buy/sell: append cashback remaining accounts after fee_config/fee_program
- Add claim_cashback instructions and TradingClient.claim_cashback_pumpfun/pumpswap()
- Add docs/PUMP_CASHBACK_README.md

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

src/instruction/utils/pumpswap.rs

@@ -185,6 +185,16 @@ pub fn get_user_volume_accumulator_pda(user: &Pubkey) -> Option<Pubkey> {
     )
 }
 
+/// WSOL ATA of UserVolumeAccumulator for Pump AMM (used for cashback remaining accounts).
+pub fn get_user_volume_accumulator_wsol_ata(user: &Pubkey) -> Option<Pubkey> {
+    let accumulator = get_user_volume_accumulator_pda(user)?;
+    Some(crate::common::fast_fn::get_associated_token_address_with_program_id_fast(
+        &accumulator,
+        &crate::constants::WSOL_TOKEN_ACCOUNT,
+        &crate::constants::TOKEN_PROGRAM,
+    ))
+}
+
 pub fn get_global_volume_accumulator_pda() -> Option<Pubkey> {
     let seeds: &[&[u8]; 1] = &[&seeds::GLOBAL_VOLUME_ACCUMULATOR_SEED];
     let program_id: &Pubkey = &&accounts::AMM_PROGRAM;

src/instruction/utils/pumpswap_types.rs

@@ -15,9 +15,11 @@ pub struct Pool {
     pub lp_supply: u64,
     pub coin_creator: Pubkey,
     pub is_mayhem_mode: bool,
+    /// Whether this pool's coin has cashback enabled
+    pub is_cashback_coin: bool,
 }
 
-pub const POOL_SIZE: usize = 1 + 2 + 32 * 6 + 8 + 32 + 1;
+pub const POOL_SIZE: usize = 1 + 2 + 32 * 6 + 8 + 32 + 1 + 1;
 
 pub fn pool_decode(data: &[u8]) -> Option<Pool> {
     if data.len() < POOL_SIZE {