Refactor PVC models and update tests

- Updated the PVC models in the database and adjusted the tests accordingly to reflect the new model counts and codes.
- Removed deprecated models from the JSON data for PVC systems.
- Added new GLB models for "scorrevole_sf_3_ante" and "scorrevole_sf_4_ante".
- Enhanced the development scripts to streamline the build process for both frontends.
- Updated documentation to reflect changes in the development environment and deployment process.
- Improved the styling of texture radio options for better visibility.
- Fixed URL handling in the configurator to ensure proper routing and API calls.

backoffice/cliente/src/api.js

@@ -1,4 +1,5 @@
-const BASE = import.meta.env.VITE_API_BASE || 'http://localhost:8000/api'
+// L'app cliente è servita dal backend stesso (/preventivo/): l'API è sulla stessa origine.
+const BASE = import.meta.env.VITE_API_BASE || `${window.location.origin}/api`
 
 async function request(path, options = {}) {
   const res = await fetch(`${BASE}${path}`, {