feat: add cooldown to prevent rapid Enchanted Armoire purchases

[CommitToday]

Fix for Issue #15541: Add Cooldown for Enchanted Armoire Purchases

Summary

This PR implements a cooldown mechanism to prevent users from making rapid, consecutive purchases from the Enchanted Armoire. A 2-second cooldown has been added to ensure that users must wait between purchases, addressing potential abuse or accidental rapid clicks.

Changes

• Added new translation strings (armoirePurchaseTooFast) in both en and en_GB locales to inform users when they are clicking too rapidly.
• Implemented a 2-second cooldown in the buyArmoire.js operation:
  • Checks the lastArmoirePurchase timestamp in the user's flags before allowing a new purchase.
  • Throws a NotAuthorized error with the new translation string if the cooldown period hasn't elapsed.
  • Updates the lastArmoirePurchase timestamp after a successful purchase.
• Updated the user schema to include a lastArmoirePurchase field to track the last purchase time.

Technical Details

• The cooldown is implemented server-side to prevent client-side bypass.
• The lastArmoirePurchase field is stored in the user's flags object in the database.
• The cooldown duration is set to 2 seconds to balance preventing spam with allowing reasonable usage.

Testing

• Verify that the cooldown prevents multiple purchases within 2 seconds
• Check that the error message is displayed appropriately
• Ensure that purchases work normally after the cooldown period has elapsed
• Confirm that the user schema change does not break existing functionality