fix(raiko): update base fee validation logic in Shasta block processing

[smtmfft]

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[Copilot]

Pull request overview

This PR refactors the base fee validation logic for Shasta blocks by simplifying the condition that determines when to use the initial base fee. The change replaces a fork-based check with a simpler block-number-based check and adds additional logging for validation failures.

Changes:

• Simplified the logic for determining when to use the initial base fee from a fork check to a simple block number comparison
• Renamed parameter from is_first_shasta_proposal to use_init_base_fee for clarity
• Added detailed warning logs when base fee validation fails in the initial block case

Reviewed changes

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

File	Description
lib/src/utils/shasta_rules.rs	Renamed parameter and added warning log with details when initial base fee validation fails
lib/src/utils/shasta.rs	Simplified the logic from checking if parent is in PACAYA fork to checking if parent block number is <= 1

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