Update Vite configuration for improved module resolution and build settings

- Changed the import path for GLTFLoader to align with the latest Three.js structure.
- Added preserveSymlinks option to the build configuration for better symlink handling.
- Updated Rollup options to explicitly define no external modules, enhancing build clarity.

frontend/vite.config.js

@@ -33,7 +33,7 @@ export default defineConfig(({ mode }) => {
             })
         },
         optimizeDeps: {
-            include: ['three', 'three/examples/jsm/loaders/GLTFLoader.js'],
+            include: ['three', 'three/addons/loaders/GLTFLoader.js'],
             esbuildOptions: {
                 plugins: [
                     NodeGlobalsPolyfillPlugin({
@@ -50,14 +50,16 @@ export default defineConfig(({ mode }) => {
                 util: 'util',
                 assert: 'assert',
             },
-            dedupe: ['three']
+            dedupe: ['three'],
+            preserveSymlinks: false
         },
         build: {
             rollupOptions: {
                 output: {
                     // Stelle sicher, dass three nicht externalisiert wird
                     manualChunks: undefined
-                }
+                },
+                external: [] // Explizit keine externen Module
             },
             commonjsOptions: {
                 include: [/three/, /node_modules/],