Create documentation for EAPTS adaptor

[mercy-ship-it]

Short Description

This PR adds comprehensive integration documentation for the EAPTS (Electronic Asset and Pharmaceutical Tracking System) adaptor

Details

• App Overview
• Data Model
• Integration Use Cases

AI Usage

Please disclose how you've used AI in this work (it's cool, we just want to know!):

• [ ] Code generation (copilot but not intellisense)
• [ ] Learning or fact checking
• [x] Strategy / design
• [ ] Optimisation / refactoring
• [ ] Translation / spellchecking / doc gen
• [ ] Other
• [ ] I have not used AI

You can read more details in our Responsible AI Policy

[mercy-ship-it]

@hunterachieng Did you check on this? https://github.com/OpenFn/docs/pull/717/files