refactor: restructure trading modules and add price calculation utilities

- Remove redundant pool.rs files from trading protocols
- Consolidate protocol logic into common.rs files
- Add comprehensive price calculation utilities for all protocols
- Add decimals constants module
- Restructure utils module for better organization
- Update documentation with price utilities information

Breaking changes:
- Removed bonding_curve.rs from pumpfun module
- Consolidated trading logic across protocols
- Refactored utils module structure

src/utils/price/mod.rs

@@ -0,0 +1,7 @@
+pub mod bonk;
+pub mod pumpfun;
+pub mod pumpswap;
+pub mod raydium_amm_v4;
+pub mod raydium_clmm;
+pub mod raydium_cpmm;
+pub mod common;