refactor: unify transaction building and execution architecture

- Remove redundant transaction builder functions and merge into single build_transaction()
- Simplify compute budget manager with unified add_compute_budget_instructions()
- Consolidate trade executor interface by removing separate buy/sell methods
- Unify BuyParams/SellParams usage, remove *WithTipParams structs
- Streamline parallel execution logic and remove TradeType parameter
- Delete obsolete files: address_lookup.rs, tip_cache.rs
- Clean up nonce manager by removing unused is_using_nonce() function

This refactoring reduces code duplication and provides a cleaner, more maintainable API
for transaction building and execution across all trading protocols.

src/trading/common/nonce_manager.rs

@@ -47,10 +47,3 @@ pub fn get_transaction_blockhash(recent_blockhash: Hash) -> Hash {
         recent_blockhash
     }
 }
-
-/// Check if using nonce account
-pub fn is_using_nonce() -> bool {
-    let nonce_cache = NonceCache::get_instance();
-    let nonce_info = nonce_cache.get_nonce_info();
-    nonce_info.nonce_account.is_some()
-}