chore(instructions): add git commit message guidelines

[Nizar Grindi (NizarGrindi)]

This pull request introduces standardized commit message instructions and configures the project to use them with GitHub Copilot Chat. The main focus is to ensure all commit messages follow the Conventional Commits specification, improving clarity and consistency across the codebase.

Commit message standardization:

• Added .github/instructions/git-commit.instructions.md with detailed guidelines for writing Conventional Commits, including type and scope definitions, formatting rules, and examples.

Editor integration:

• Updated .vscode/settings.json to configure GitHub Copilot Chat to use the new commit message instructions file for commit message generation.

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