docs(solidity): clarify EVM-based compiler compatibility

[gzliudan]

Proposed changes

improve document about solidity compatibility version

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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
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[Copilot]

Pull request overview

Updates Solidity compatibility guidance to emphasize EVM-fork targeting (Cancun/Prague/Osaka) over pinning a single solc version, helping contract developers choose compiler settings that match XDPoSChain fork support.

Changes:

• Replaces per-network “Solidity version” bullets with an EVM-fork compatibility explanation.
• Adds a network fork-status table (Cancun/Prague/Osaka) and a recommended compiler-settings table.
• Adds notes on repo fixtures and caution around Osaka-only features (e.g., CLZ).

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[Copilot]

Pull request overview

Copilot reviewed 1 out of 1 changed files in this pull request and generated 2 comments.

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