Add Wiki documentation for issues #137-#140 Created comprehensive Wiki pages: 1. MySQL-Timestamp-Compatibility.md (#137) - MySQL 5.7.24+ fix for multiple TIMESTAMP columns 2. Test-Case-Linking-Fix.md (#138) - INACTIVE requirement version crash fix 3. Font-Awesome-Modernization.md (#139) - UI icon system modernization status 4. PHP81-Compatibility.md (#140) - strftime() and type-safe count operations Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>