Refactor model path handling in Character3D component

- Introduced a constant for the models API path to streamline model path construction.
- Updated modelPath method to utilize the new constant, improving code clarity and maintainability.
- Adjusted fallback model path logic to ensure consistent API usage.

frontend/src/components/Character3D.vue

@@ -9,6 +9,9 @@ import { GLTFLoader } from 'three/addons/loaders/GLTFLoader.js';
 import { DRACOLoader } from 'three/addons/loaders/DRACOLoader.js';
 import { getApiBaseURL } from '@/utils/axios.js';
 
+/** Backend-Route: GET /api/models/3d/falukant/characters/:filename (Proxy mit Draco-Optimierung) */
+const MODELS_API_PATH = '/api/models/3d/falukant/characters';
+
 export default {
   name: 'Character3D',
   props: {
@@ -76,11 +79,9 @@ export default {
       return 'adult';
     },
     modelPath() {
-      const gender = this.actualGender;
-      const ageGroup = this.ageGroup;
       const base = getApiBaseURL();
-      const prefix = base ? `${base}/api/models/3d/falukant/characters` : '/api/models/3d/falukant/characters';
-      return `${prefix}/${gender}_${ageGroup}.glb`;
+      const prefix = base ? `${base}${MODELS_API_PATH}` : MODELS_API_PATH;
+      return `${prefix}/${this.actualGender}_${this.ageGroup}.glb`;
     }
   },
   watch: {
@@ -204,9 +205,9 @@ export default {
         const loader = new GLTFLoader();
         loader.setDRACOLoader(dracoLoader);
 
-        const modelPath = this.modelPath;
         const base = getApiBaseURL();
-        const prefix = base ? `${base}/api/models/3d/falukant/characters` : '/api/models/3d/falukant/characters';
+        const prefix = base ? `${base}${MODELS_API_PATH}` : MODELS_API_PATH;
+        const modelPath = this.modelPath;
         const fallbackPath = `${prefix}/${this.actualGender}.glb`;
 
         let gltf;