feat: integrate Draco compression for GLB models and implement encryption for secure loading

- Added DRACOLoader to starter.js for handling compressed GLB models.
- Created a createGltfLoader function to initialize GLTFLoader with DRACOLoader.
- Implemented dracoModels plugin in vite.config.js to compress GLB models during build.
- Introduced model_loader.js for loading encrypted GLB models with WebCrypto.
- Developed encryptModels plugin to encrypt GLB files, ensuring no clear models are exposed.
- Updated asset handling to remove uncompressed GLB files post-build.

vite.config.js

@@ -2,6 +2,9 @@ import { defineConfig } from 'vite';
 import path from 'path';
 import { viteStaticCopy } from 'vite-plugin-static-copy';
 import { ViteMinifyPlugin } from 'vite-plugin-minify'
+import dracoModels from './vite-plugins/draco-models.js';
+// Cifratura dei modelli, pronta ma non attiva: vedi vite-plugins/encrypt-models.js.
+// import encryptModels from './vite-plugins/encrypt-models.js';
 
 export default defineConfig({
     // Il configuratore è servito da Laravel sotto /configuratore/ (stessa origine dell'API):
@@ -26,11 +29,16 @@ export default defineConfig({
         viteStaticCopy({
             targets: [
                 {
-                    src: 'assets',
-                    dest: ''
+                    // I modelli 3D non vengono copiati così come sono: li comprime dracoModels.
+                    src: ['assets/*', '!assets/models'],
+                    dest: 'assets'
                 }
             ]
         }),
+        dracoModels({
+            modelsDir: path.resolve(__dirname, 'src/assets/models'),
+            cacheDir: path.resolve(__dirname, 'node_modules/.cache/draco-models'),
+        }),
         ViteMinifyPlugin({
             minify: {
                 removeComments: true,