common: fix block numbers for EIP-1559 and cancun

[gzliudan]

Proposed changes

fix block numbers for EIP-1559 and cancun

Types of changes

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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)
• Regular KTLO or any of the maintaince work. e.g code style
• CICD Improvement

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
• 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 updates the mainnet constants to set activation block numbers for EIP-1559 and Cancun hard fork upgrades, replacing the previous placeholder values of math.MaxInt64 (which effectively disabled these features) with specific block numbers targeting January 28th, 2026.

Changes:

• Set EIP-1559 activation to block 98800200 (Target: Jan 28, 2026)
• Set Cancun upgrade activation to block 98802000 (Target: Jan 28, 2026)

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