refactor: restructure to monorepo with backends and apiTest

- Move web/backend to backends/potter-api
- Move web/frontend to backends/potter-api/frontend
- Add root package.json with npm workspaces
- Update README.md with monorepo navigation
- Update .github/workflows/api-tests.yml for dynamic test discovery
- Update bruno_test_scenario.md paths
- Fix .gitignore to allow JSON data files
- Add three new AI tests in apiTest/PotterAPI/AI/

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

backends/potter-api/README.md

@@ -0,0 +1,41 @@
+# PotterAPI
+
+### Prerequisites
+1. Installed [NodeJS](https://nodejs.org/en/)
+
+### Installation
+
+1. Open terminal and run following commands
+```
+git clone https://github.com/skarbala/PotterAPI.git
+cd PotterAPI
+npm install
+```
+
+2. Run the API using
+```
+npm start
+```
+
+#### ✅ You should see following message
+ > Harry Potter App listening on port 3000!
+
+## Documentation
+
+#### Base url
+All routes needs to be send to base url `http://localhost:3000`
+
+#### Response type
+Default response format is `application/json`
+
+### Spells service
+#### Authentication
+No authentication needed
+#### Available endpoints
+``` GET /spells ``` 					returns list spells
+
+``` GET /spells/{id} ``` 			returns specific spell. 
+
+``` DELETE /spells/{id} ``` 	deletes spell
+
+```POST /spells```	adds new spell