Function parse_instruction 

pub fn parse_instruction(
    instruction_data: &[u8],
    accounts: &[Pubkey],
    signature: Signature,
    slot: u64,
    tx_index: u64,
    block_time_us: Option<i64>,
    grpc_recv_us: i64,
) -> Option<DexEvent>

Main PumpFun instruction parser

Outer instructions (8-byte discriminator): CREATE, CREATE_V2 从指令解析并返回事件； BUY/SELL 仍以 log 为主。Inner CPI: MIGRATE_EVENT_LOG 仅在此解析。