Switch LazyTransaction gas caps from *big.Int to *uint256.Int and convert once at pending retrieval time.
In miner ordering, keep fee comparisons on uint256 and precompute TRC21 gas price in uint256 form to avoid repeated big-int conversions in heap comparisons.
Also update affected tests and call sites in legacypool/worker/helper paths.
Compatibility: LazyTransaction exported field types changed (GasFeeCap/GasTipCap).
Synchronize miner gas tip updates across subsystems when RPC updates gas price.
- update eth miner API to apply gas tip changes to both txpool and miner
- add miner/worker SetGasTip path and initialize worker tip from config
- adjust bind util test to use params.GWei over base fee
Ref: #28933
Miner configuration is unified under [Eth.Miner] (GasCeil/GasPrice/Etherbase/ExtraData), replacing legacy top-level [Eth] miner keys.
Operational impact: existing config files using [Eth].GasPrice/[Eth].Etherbase/[Eth].ExtraData must be migrated before upgrade.
Behavior update: gasprice=0 remains valid; only negative gas prices are sanitized at startup.
Default change: XDCGenesisGasLimit is reduced to 42,000,000 and now feeds miner default GasCeil (including default --miner-gaslimit), so nodes relying on defaults should review capacity expectations.
