feat(swqos): add Lightspeed (Solana Vibe Station) support

- Add LightspeedClient using standard JSON-RPC sendTransaction
- Add tip accounts (53PhM..., 9tYF5...)
- Add minimum tip constant (0.001 SOL)
- Endpoint format: https://<tier>.rpc.solanavibestation.com/lightspeed?api_key=<key>

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/trading/core/async_executor.rs

@@ -27,6 +27,7 @@ use crate::{
         SWQOS_MIN_TIP_BLOCKRAZOR,
         SWQOS_MIN_TIP_ASTRALANE,
         SWQOS_MIN_TIP_STELLIUM,
+        SWQOS_MIN_TIP_LIGHTSPEED,
     },
 };
 
@@ -169,6 +170,7 @@ pub async fn execute_parallel(
                             SwqosType::BlockRazor => SWQOS_MIN_TIP_BLOCKRAZOR,
                             SwqosType::Astralane => SWQOS_MIN_TIP_ASTRALANE,
                             SwqosType::Stellium => SWQOS_MIN_TIP_STELLIUM,
+                            SwqosType::Lightspeed => SWQOS_MIN_TIP_LIGHTSPEED,
                             SwqosType::Default => SWQOS_MIN_TIP_DEFAULT,
                         };
                         if config.2.tip < min_tip {