Add clang-format hooks

[deevus]

Summary

• Add hk configuration for clang-format pre-commit auto-formatting
• Add hk check hook for clang-format verification
• Add committed .clang-format and format existing C/H files
• Disable include sorting to preserve legacy include ordering and keep libcdio builds working

Verification

• MISE_TRUSTED_CONFIG_PATHS=$PWD mise x -- hk validate
• MISE_TRUSTED_CONFIG_PATHS=$PWD mise x -- hk check --all
• MISE_TRUSTED_CONFIG_PATHS=$PWD mise x -- zig build
• MISE_TRUSTED_CONFIG_PATHS=$PWD mise x -- zig build run
• final reviewer found no blockers