[Enhancement]: Update copyright year and Checkstyle rule enforcement #313

What

Update the project to ensure all copyright years are current (2025) across source files and configuration. Revise any Checkstyle configuration that enforces or validates copyright statements to match the latest year, and adjust all source headers accordingly.

Why

Keeping copyright information current is important for legal compliance and project professionalism. Ensuring the Checkstyle rules remain accurate helps maintain consistency and enables automated checks to catch outdated copyright statements.

Notes

This enhancement should include a review of the Checkstyle rules and automated scripts if present, plus updates to all source file headers (Java and others).