feat(eth,miner): wire miner gas tip updates from RPC #28933

[gzliudan]

Proposed changes

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

Ref: ethereum#28933

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• build: Changes that affect the build system or external dependencies
• ci: Changes to CI configuration files and scripts
• chore: Changes that don't change source code or tests
• docs: Documentation only changes
• feat: A new feature
• fix: A bug fix
• perf: A code change that improves performance
• refactor: A code change that neither fixes a bug nor adds a feature
• revert: Revert something
• style: Changes that do not affect the meaning of the code
• test: Adding missing tests or correcting existing tests

Impacted Components

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• Consensus
• Account
• Network
• Geth
• Smart Contract
• External components
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Checklist

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• This PR has sufficient test coverage (unit/integration test) OR I have provided reason in the PR description for not having test coverage
• Tested on a private network from the genesis block and monitored the chain operating correctly for multiple epochs.
• Provide an end-to-end test plan in the PR description on how to manually test it on the devnet/testnet.
• Tested the backwards compatibility.
• Tested with XDC nodes running this version co-exist with those running the previous version.
• Relevant documentation has been updated as part of this PR
• N/A

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[Copilot]

Pull request overview

Synchronizes miner gas tip (RPC miner_setGasPrice) updates across the txpool and miner, while refactoring mining configuration into a dedicated ethconfig.Config.Miner struct and removing the previous global gas limit target.

Changes:

• Wire RPC gas price updates to both TxPool.SetGasTip and a new miner SetGasTip path.
• Introduce miner.Config (Etherbase/ExtraData/GasCeil/GasPrice), migrate CLI + TOML config to ethconfig.Config.Miner, and sanitize miner config in eth.New.
• Replace the removed params.TargetGasLimit usage with Miner.GasCeil in block building/tests.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
params/protocol_params.go	Adjusts XDCGenesisGasLimit and removes TargetGasLimit global.
miner/worker.go	Refactors worker to use miner.Config, adds tip storage and setter, updates tx commit call signature.
miner/miner.go	Adds miner.Config + defaults; exposes Miner.SetGasTip.
eth/ethconfig/gen_config.go	Updates TOML marshal/unmarshal to include Config.Miner.
eth/ethconfig/config.go	Moves mining-related settings under Config.Miner; updates defaults and go:generate.
eth/backend.go	Uses Config.Miner.* and adds sanitization for miner gas ceil/price.
eth/api_miner.go	Updates RPC gas price setter to also notify the miner.
core/chain_makers.go	Replaces TargetGasLimit usage with XDCGenesisGasLimit.
core/bench_test.go	Replaces TargetGasLimit usage with XDCGenesisGasLimit.
console/console_test.go	Updates test config construction to set Miner.Etherbase.
cmd/utils/flags.go	Routes miner flags into cfg.Miner (new setMiner) and updates defaults.
cmd/XDC/main.go	Removes runtime mutation of params.TargetGasLimit.
accounts/abi/bind/v2/util_test.go	Adjusts test gas price offset to params.GWei.

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