perf: P0/P1/P2 low-latency and maintainability improvements

P0:
- blockhash/nonce: get_transaction_blockhash returns Result; buy/sell entry validation
- Bonk sell: remove RPC get_token_balance from build path; require caller to pass input_amount
- Hot path: drop redundant dex_type/protocol_params clone; tip via sol_f64_to_lamports (no String)
- compute_budget cache uses Arc; extend_compute_budget_instructions avoids SmallVec clone

P1:
- middleware protocol_name takes &str; executor destructures result once to avoid signatures/submit_timings clone
- Error messages include dex context; params use Copy for Pubkey; pumpswap utils clone only Pool for pools[0]

P2:
- transaction_pool capacity constants; TIP_ACCOUNT_CACHE marked allow(dead_code)
- Fix error copy in raydium_amm_v4 / meteora_damm_v2 to correct protocol names

Made-with: Cursor

src/trading/core/params.rs

@@ -398,7 +398,7 @@ impl PumpSwapParams {
         );
 
         Ok(Self {
-            pool: pool_address.clone(),
+            pool: *pool_address,
             base_mint: pool_data.base_mint,
             quote_mint: pool_data.quote_mint,
             pool_base_token_account: pool_data.pool_base_token_account,
@@ -671,7 +671,7 @@ impl RaydiumCpmmParams {
             )
             .await?;
         Ok(Self {
-            pool_state: pool_address.clone(),
+            pool_state: *pool_address,
             amm_config: pool.amm_config,
             base_mint: pool.token0_mint,
             quote_mint: pool.token1_mint,
@@ -778,7 +778,7 @@ impl MeteoraDammV2Params {
         let pool_data =
             crate::instruction::utils::meteora_damm_v2::fetch_pool(rpc, pool_address).await?;
         Ok(Self {
-            pool: pool_address.clone(),
+            pool: *pool_address,
             token_a_vault: pool_data.token_a_vault,
             token_b_vault: pool_data.token_b_vault,
             token_a_mint: pool_data.token_a_mint,