feat: add 10% buffer to swap amounts for LP slippage protection

- Add 10% buffer when swapping Token A to prevent slippage
- Add 10% buffer when swapping Token B to prevent slippage
- Log both required amount and swap amount with buffer for transparency

src/core/sniper.js

@@ -81,16 +81,18 @@ export class SniperEngine {
     logger.info(`  Token B: ${tokenB.amount} ${tokenB.symbol || ''} (${formatUsd(tokenB.valueUsd)})`);
     logger.info(`  Estimated Total Value: ${formatUsd(calculation.estimatedValue)}`);
 
-    // Step 2: Check and swap Token A
+    // Step 2: Check and swap Token A (add 10% buffer for slippage)
     const tokenABalance = await this.swapper.getTokenBalance(tokenA.address);
     const requiredAmountA = parseFloat(tokenA.amount);
+    const swapAmountA = requiredAmountA * 1.1; // Add 10% buffer
     
     if (tokenABalance < requiredAmountA * 0.95) {
       logger.info(`Token A balance insufficient: ${tokenABalance.toFixed(4)} < ${requiredAmountA.toFixed(4)}`);
+      logger.info(`Swapping with 10% buffer: ${swapAmountA.toFixed(4)} (required: ${requiredAmountA.toFixed(4)})`);
       const success = await this.swapper.swapIfNeeded(
         'So11111111111111111111111111111111111111112', // Use SOL as source
         tokenA.address,
-        requiredAmountA,
+        swapAmountA,
         tokenA.decimals
       );
       if (!success) {
@@ -101,16 +103,18 @@ export class SniperEngine {
       logger.success(`Token A balance sufficient: ${tokenABalance.toFixed(4)} >= ${requiredAmountA.toFixed(4)}`);
     }
 
-    // Step 3: Check and swap Token B
+    // Step 3: Check and swap Token B (add 10% buffer for slippage)
     const tokenBBalance = await this.swapper.getTokenBalance(tokenB.address);
     const requiredAmountB = parseFloat(tokenB.amount);
+    const swapAmountB = requiredAmountB * 1.1; // Add 10% buffer
     
     if (tokenBBalance < requiredAmountB * 0.95) {
       logger.info(`Token B balance insufficient: ${tokenBBalance.toFixed(4)} < ${requiredAmountB.toFixed(4)}`);
+      logger.info(`Swapping with 10% buffer: ${swapAmountB.toFixed(4)} (required: ${requiredAmountB.toFixed(4)})`);
       const success = await this.swapper.swapIfNeeded(
         'EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v', // Use USDC as source
         tokenB.address,
-        requiredAmountB,
+        swapAmountB,
         tokenB.decimals
       );
       if (!success) {