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

src/common/types.rs

@@ -76,6 +76,8 @@ pub struct TradeConfig {
     pub use_core_affinity: bool,
     /// Whether to output all SDK logs (timing, SWQOS submit/confirm, WSOL, blacklist, etc.). Default true.
     pub log_enabled: bool,
+    /// Whether to check minimum tip per SWQOS provider (filter out configs below min). Default false to save latency.
+    pub check_min_tip: bool,
 }
 
 impl TradeConfig {
@@ -96,6 +98,7 @@ impl TradeConfig {
             use_seed_optimize: true,           // default: use seed optimization
             use_core_affinity: true,           // default: pin parallel submit tasks to cores
             log_enabled: true,                 // default: enable all SDK logs
+            check_min_tip: false,              // default: skip min tip check to reduce latency
         }
     }
 
@@ -109,6 +112,12 @@ impl TradeConfig {
         self.use_seed_optimize = use_seed_optimize;
         self
     }
+
+    /// Set whether to check minimum tip per SWQOS (filter out configs below min). Default false for lower latency.
+    pub fn with_check_min_tip(mut self, check_min_tip: bool) -> Self {
+        self.check_min_tip = check_min_tip;
+        self
+    }
 }
 
 pub type SolanaRpcClient = solana_client::nonblocking::rpc_client::RpcClient;