[WIP] Fix issue number 15

[Copilot]

• Understand issue Bug: Do not set debug constants #15: Wrap debug constants with if (!defined()) checks
• Modify enableWPDebug() function to:
  • Check if constants already exist (including const syntax)
  • Only add new constants wrapped with if (!defined()) checks
  • Skip modification of existing constants
• Modify cleanup() function to:
  • Only remove constants that were added by the app (wrapped with if (!defined()))
  • Leave user's original constants untouched
• Test the changes with a mock WordPress config file
• Run code review

Original prompt

Create a fix for issue #15

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