Set up project configuration and build scripts for MONEI Python SDK

- Add package.json with build and release scripts
- Configure OpenAPI generator with config.json and openapitools.json
- Create post-build and release shell scripts
- Update .gitignore for Yarn and project-specific files
- Add .yarnrc.yml to configure node modules linking

Author: jimmyn

.gitignore

@@ -69,19 +69,19 @@ target/
 
 ##### MONEI Custom
 
-build/node_modules/
-build/openapi.json
+node_modules/
+openapi.json
 test.py
 
 .idea
 
 # Yarn
-/build/.yarn/*
-!/build/.yarn/patches
-!/build/.yarn/plugins
-!/build/.yarn/releases
-!/build/.yarn/sdks
-!/build/.yarn/versions
+.yarn/*
+!.yarn/patches
+!.yarn/plugins
+!.yarn/releases
+!.yarn/sdks
+!.yarn/versions
 
 ##### UV specific
 .uv/.cache/