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/mod.rs

@@ -1,5 +1,7 @@
 pub mod bonk;
 pub mod meteora_damm_v2;
+pub(crate) mod pumpfun_ix_data;
+pub(crate) mod pumpswap_ix_data;
 pub mod pumpfun;
 pub mod pumpswap;
 pub mod raydium_amm_v4;