Added detailed documentation: ARCHITECTURE.md, CONVENTIONS.md, GLOSSARY.md, and copilot-instructions.md for Mango.Nop.Core, Data, and Services. Updated/added README.md files for all Mango.Nop libraries and the FruitBank nopCommerce plugin, clarifying structure, key types, and usage. Switched appsettings.json connection string from production to development database. These changes improve developer onboarding and enforce architectural consistency.