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/routes/spells.js

@@ -0,0 +1,23 @@
+const express = require('express');
+const router = express.Router();
+const spells = require('../spells.json');
+const spellController = require('../controllers/spellsController.js')
+module.exports = router;
+const authChecker = require('../middleware/header.js')
+
+router.get('/', spellController.spells_list);
+
+router.post('/', authChecker.checkHeader, spellController.new_spell);
+
+router.get('/:spellId', spellController.specific_spell)
+
+router.delete('/:spellId', spellController.delete_spell)
+
+router.delete('/actions/deleteAll', spellController.delete_all)
+
+router.get('/actions/reset', spellController.reset)
+
+router.put('/:spellId', authChecker.checkHeader, spellController.update_spell)
+
+
+