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/sortinghat.js

@@ -0,0 +1,25 @@
+const express = require('express');
+const router = express.Router();
+module.exports = router;
+const houses = require('../houses.json')
+const sortingHatQuotes = require('../sortinghatquotes.json')
+
+function getRandomHouseName() {
+    let houseNames = houses.map(house => house.name);
+    return houseNames[Math.floor(Math.random() * houseNames.length)];
+}
+
+function getRandomQuote() {
+    return sortingHatQuotes[Math.floor(Math.random() * sortingHatQuotes.length)];
+}
+
+router.get('/', function (req, res) {
+    let house = getRandomHouseName();
+    setTimeout(() => {
+        return res.json({
+            sortingHatSays: getRandomQuote() + ' ' + house,
+            house: house
+        })
+    }, 500)
+
+});