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/controllers/housesController.js

@@ -0,0 +1,14 @@
+const houses = require('../houses.json');
+
+exports.houses_list = function (req, res) {
+    res.json(houses);
+}
+
+exports.specific_house = function (req, res) {
+    let result = houses.find(house => house.id == req.params.houseId);
+    if (typeof result == 'undefined') {
+        res.status(404)
+        res.send({ message: "House not found" });
+    }
+    res.send(result);
+}