feat: add Node1 minimum tip amount validation (0.002 SOL)

- Add intelligent tip amount detection for Node1
- Implement MIN_TIP_AMOUNT check in transaction builder
- Add MIN_TIP_AMOUNT.md documentation
- Optimize pumpswap instruction handling
- Update common utility functions

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

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

src/swqos/common.rs

@@ -28,7 +28,7 @@ impl FormatBase64VersionedTransaction for VersionedTransaction {
 }
 
 pub async fn poll_transaction_confirmation(rpc: &SolanaRpcClient, txt_sig: Signature) -> Result<Signature> {
-    let timeout: Duration = Duration::from_secs(10);
+    let timeout: Duration = Duration::from_secs(15);  // 🔧 增加到15秒，避免网络拥堵时超时
     let interval: Duration = Duration::from_millis(1000);
     let start: Instant = Instant::now();