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/constants/decimals.rs

@@ -0,0 +1,2 @@
+pub const SOL_DECIMALS: u8 = 9;
+pub const DEFAULT_TOKEN_DECIMALS: u8 = 6;

src/constants/mod.rs

@@ -4,6 +4,7 @@ pub mod pumpswap;
 pub mod swqos;
 pub mod trade;
 pub mod raydium_cpmm;
+pub mod decimals;
 
 pub mod trade_platform {
     pub const PUMPFUN: &'static str = "pumpfun";