Implement comprehensive FatturaPA (Italian e-invoicing) support with 300+ fields, XML/JSON exporters, and full test coverage#77

maxchampoux merged 4 commits into

mainWellApp-ai/Well:mainfrom

copilot/fix-227acba3-3bd3-4606-8c23-c7aefcd87ddfWellApp-ai/Well:copilot/fix-227acba3-3bd3-4606-8c23-c7aefcd87ddfCopy head branch name to clipboard