FrappeERP API SuiteEndpoint-first docs and automated tests for ERPNext v16

Endpoint-first API documentation and testing suite for ERPNext v16, covering 20+ modules with Markdown guides, Postman collections, and an interactive docs UI. A Pytest suite automatically validates CRUD and submit/cancel operations against live ERPNext DocTypes across every major module. An Obsidian-based knowledge graph links modules, DocTypes, and business flows to give LLM coding agents structured ERPNext API context, while the React/Vite docs UI generates copy-ready cURL, Python, and Node.js request samples for every endpoint.