fix(instruction): complete pump ix modules and pumpfun utils after params split

Adds pumpfun_ix_data / pumpswap_ix_data; exports used by trading::core::params::PumpFunParams.
chore(release): bump version to 4.0.6

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

src/instruction/pumpswap_ix_data.rs

@@ -0,0 +1,51 @@
+//! PumpSwap AMM `buy` / `buy_exact_quote_in` / `sell` instruction **data**（栈数组、无 `Vec` 分配）。
+
+use crate::instruction::utils::pumpswap::{
+    BUY_DISCRIMINATOR, BUY_EXACT_QUOTE_IN_DISCRIMINATOR, SELL_DISCRIMINATOR,
+};
+
+#[inline(always)]
+pub fn encode_pumpswap_buy_two_args(base_amount_out: u64, max_quote_amount_in: u64) -> [u8; 24] {
+    let mut d = [0u8; 24];
+    d[..8].copy_from_slice(&BUY_DISCRIMINATOR);
+    d[8..16].copy_from_slice(&base_amount_out.to_le_bytes());
+    d[16..24].copy_from_slice(&max_quote_amount_in.to_le_bytes());
+    d
+}
+
+#[inline(always)]
+pub fn encode_pumpswap_buy_ix_data(
+    base_amount_out: u64,
+    max_quote_amount_in: u64,
+    track_volume: u8,
+) -> [u8; 25] {
+    let mut d = [0u8; 25];
+    d[..8].copy_from_slice(&BUY_DISCRIMINATOR);
+    d[8..16].copy_from_slice(&base_amount_out.to_le_bytes());
+    d[16..24].copy_from_slice(&max_quote_amount_in.to_le_bytes());
+    d[24] = track_volume;
+    d
+}
+
+#[inline(always)]
+pub fn encode_pumpswap_buy_exact_quote_in_ix_data(
+    spendable_quote_in: u64,
+    min_base_amount_out: u64,
+    track_volume: u8,
+) -> [u8; 25] {
+    let mut d = [0u8; 25];
+    d[..8].copy_from_slice(&BUY_EXACT_QUOTE_IN_DISCRIMINATOR);
+    d[8..16].copy_from_slice(&spendable_quote_in.to_le_bytes());
+    d[16..24].copy_from_slice(&min_base_amount_out.to_le_bytes());
+    d[24] = track_volume;
+    d
+}
+
+#[inline(always)]
+pub fn encode_pumpswap_sell_ix_data(base_amount_in: u64, min_quote_amount_out: u64) -> [u8; 24] {
+    let mut d = [0u8; 24];
+    d[..8].copy_from_slice(&SELL_DISCRIMINATOR);
+    d[8..16].copy_from_slice(&base_amount_in.to_le_bytes());
+    d[16..24].copy_from_slice(&min_quote_amount_out.to_le_bytes());
+    d
+}