refactor(eth): remove duplicated chain config source #19344

[gzliudan]

Proposed changes

Drop Ethereum.chainConfig and consistently read chain configuration from blockchain.Config() to avoid dual sources of truth.

Changes include API/backend call sites and DebugAPI constructor cleanup. No functional behavior change is intended.

Ref: ethereum#19344

Types of changes

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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
• Not sure (Please specify below)

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

Removes the duplicated chainConfig field from the Ethereum struct, consolidating chain config access through blockchain.Config() to maintain a single source of truth.

Changes:

• Remove Ethereum.chainConfig field and update all references to use either the local variable (in New()) or blockchain.Config()
• Simplify DebugAPI by removing its unused config field and the corresponding constructor parameter
• Update EthAPIBackend and EthereumAPI methods to read config from blockchain.Config()

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
eth/backend.go	Remove chainConfig field from struct; use local var in New() and blockchain.Config() elsewhere
eth/api_debug.go	Remove unused config field from DebugAPI; simplify constructor
eth/api_backend.go	Replace eth.chainConfig with eth.blockchain.Config()
eth/api.go	Replace eth.chainConfig with eth.blockchain.Config()

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