feat: Helius Sender SWQOS support and global check_min_tip option

- Add Helius Sender client (helius.rs) with dual routing and swqos_only mode
- Helius min tip: 0.0002 SOL default, 0.000005 SOL when swqos_only=true
- Add TradeConfig.check_min_tip (default false) to skip min-tip validation for lower latency
- Thread check_min_tip through SwapParams and execute_parallel; only call min_tip_sol when enabled
- Add SWQOS_ENDPOINTS_HELIUS and HELIUS_TIP_ACCOUNTS in constants
- Extend SwqosConfig/SwqosType for Helius; add Helius to get_endpoint and get_swqos_client
- Update trading_client, shared_infrastructure and middleware_system examples

Made-with: Cursor

examples/middleware_system/src/main.rs

@@ -1,9 +1,9 @@
 use anyhow::Result;
 use sol_trade_sdk::{
     common::{AnyResult, TradeConfig},
-    swqos::{SwqosConfig, SwqosRegion},
+    swqos::SwqosConfig,
     trading::{
-        core::params::{PumpSwapParams, DexParamEnum}, factory::DexType, middleware::builtin::LoggingMiddleware,
+        core::params::{PumpSwapParams, DexParamEnum}, factory::DexType,
         InstructionMiddleware, MiddlewareManager,
     },
     SolanaTrade, TradeTokenType,
@@ -30,8 +30,8 @@ impl InstructionMiddleware for CustomMiddleware {
     fn process_protocol_instructions(
         &self,
         protocol_instructions: Vec<Instruction>,
-        protocol_name: String,
-        is_buy: bool,
+        _protocol_name: String,
+        _is_buy: bool,
     ) -> Result<Vec<Instruction>> {
         // do anything you want here
         // you can modify the instructions here
@@ -41,8 +41,8 @@ impl InstructionMiddleware for CustomMiddleware {
     fn process_full_instructions(
         &self,
         full_instructions: Vec<Instruction>,
-        protocol_name: String,
-        is_buy: bool,
+        _protocol_name: String,
+        _is_buy: bool,
     ) -> Result<Vec<Instruction>> {
         // do anything you want here
         // you can modify the instructions here