feat: enhance SplFileInfo toLog() method / Issue #103

[atournayre]

Summary

Enhance SplFileInfo::toLog() method to provide comprehensive file information for logging purposes.

Resolves #103

Changes

• Enhanced toLog() method with 5 fields:

  • filename: File name as string
  • extension: File extension as string
  • size: Human-readable size (B, KB, MB, GB)
  • relativePath: Relative path as string
  • relativePathname: Full relative pathname as string

• Added 13 comprehensive unit tests covering:

  • Array structure validation
  • Data type validation
  • Value accuracy validation

Testing

• Unit tests: 13 tests added in SplFileInfoTest.php
• All tests follow Elegant Object principles (1 assertion per test)
• QA skipped (PHP 8.2.22 required, local 8.1.2)

Checklist

• Code follows project standards
• Tests added/updated
• Documentation updated