Add Pumpfun mayhem mode detection

[TornGuard]

Summary

Implements detection for Pumpfun's new mayhem mode feature as requested in #90.

What is Mayhem Mode?

Mayhem mode is an optional feature for Pumpfun tokens created with the create_v2 instruction. Coins with mayhem mode enabled use a different fee recipient account (GesfTA3X2arioaHp8bbKdjG9vJtskViWACZoYvxp4twS).

Changes

Type Definitions

• Added isMayhemMode?: boolean field to TradeInfo interface (src/types/trade.ts)
• Added isMayhemMode?: boolean field to MemeEvent interface (src/types/meme.ts)
• Added isMayhemMode: boolean field to PumpswapBuyEvent and PumpswapSellEvent interfaces (src/types/pumpswap.ts)

Constants

• Added mayhem fee recipient to FEE_ACCOUNTS array (src/constants/programId.ts)

Detection Logic

• Pumpfun parser (src/parsers/pumpfun/parser-pumpfun-event.ts): Checks if mayhem fee recipient exists in transaction account keys
• Pumpswap parser (src/parsers/pumpfun/parser-pumpswap-event.ts): Checks if protocol fee recipient matches mayhem fee recipient

Technical Details

• Mayhem Fee Recipient: GesfTA3X2arioaHp8bbKdjG9vJtskViWACZoYvxp4twS
• Detection Method:
  • For Pumpfun bonding curve trades: Check if mayhem fee recipient is in transaction accounts
  • For Pumpswap trades: Check if protocolFeeRecipient field equals mayhem fee recipient
• Result: isMayhemMode is set to true when detected, making it easy for users to identify mayhem mode trades

Testing

• ✅ Project builds successfully with TypeScript
• ✅ All type definitions properly updated
• ✅ Detection logic integrated into existing parsers

Example Usage

const parser = new DexParser();
const result = await parser.parseAll(transaction);

if (result.trades && result.trades.length > 0) {
  const trade = result.trades[0];
  if (trade.isMayhemMode) {
    console.log('This is a mayhem mode trade!');
  }
}

Closes #90