1.1.2 feat: Add PwingEco integration

• Added support for PwingEco as an optional soft dependency:
  • Created PwingEcoIntegration to handle economy operations using ShopIntegrationAPI.
  • Updated RespawnEconomy to support both Vault and PwingEco for economy-related features.
  • Configurable currency name added to config.yml under economy.currency.