refactor(txpool): remove wrapper type #27841

[gzliudan]

Proposed changes

Partial backport of PR ethereum#27841 which only limited to txpool wrapper removal.

• Migrate txpool interfaces/call sites from *txpool.Transaction to *types.Transaction
• Update eth/miner/contracts paths and related tests accordingly
• No intended behavior change

Blob sidecar validation/handling changes from upstream are not included here.

Ref: ethereum#27841

Types of changes

What types of changes does your code introduce to XDC network?
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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

Which parts of the codebase does this PR touch?
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• Consensus
• Account
• Network
• Geth
• Smart Contract
• External components
• Not sure (Please specify below)

Checklist

Put an ✅ in the boxes once you have confirmed below actions (or provide reasons on not doing so) that

• 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

This PR refactors txpool-facing APIs to remove the *txpool.Transaction wrapper and use *types.Transaction directly across txpool interfaces and key call sites (miner + eth protocol/backend), aiming to keep runtime behavior unchanged while simplifying types.

Changes:

• Removed txpool.Transaction wrapper usage from txpool interfaces (SubPool, TxPool, LegacyPool) and LazyTransaction.Resolve.
• Updated miner transaction handling and ordering logic/tests to work with *types.Transaction directly.
• Updated eth protocol, sync, handler, and API backend paths (plus tests/helpers) to pass/consume *types.Transaction directly.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
miner/worker.go	Adjusts miner’s lazy-tx construction and resolved-tx usage to *types.Transaction.
miner/ordering.go	Updates ordering logic to operate on resolved *types.Transaction directly.
miner/ordering_test.go	Updates ordering tests to reflect the new lazy/resolved transaction types.
eth/sync.go	Sync loop now extracts resolved *types.Transaction directly from lazy txs.
eth/protocol.go	Updates the txPool interface to accept []*types.Transaction.
eth/protocol_test.go	Updates protocol tests to fill the pool with *types.Transaction directly.
eth/helper_test.go	Updates test txpool implementation to match the new interface types.
eth/handler.go	Removes wrapper conversion before calling txpool.Add.
eth/api_backend.go	Updates SendTx / pool getters to use *types.Transaction directly.
core/txpool/txpool.go	Changes TxPool Get/Add signatures and internal splitting/filtering to use *types.Transaction.
core/txpool/subpool.go	Removes txpool.Transaction wrapper type; LazyTransaction and SubPool operate on *types.Transaction.
core/txpool/legacypool/legacypool.go	Updates pending lazy txs, Add, and Get to use *types.Transaction directly.
contracts/utils.go	Updates contract helper to add signed txs to the pool without wrapper allocation.

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