Implement model optimization and caching for 3D characters

- Added a new modelsProxyRouter to handle requests for optimized 3D character models.
- Introduced modelsProxyService to manage GLB file optimization using gltf-transform with Draco compression.
- Updated app.js to include the new modelsProxyRouter for API access.
- Enhanced .gitignore to exclude model cache files.
- Added scripts for optimizing GLB models and updated README with optimization instructions.
- Integrated DRACOLoader in Character3D.vue for loading compressed models.
- Updated FamilyView.vue to streamline character rendering logic.

backend/app.js

@@ -12,6 +12,7 @@ import socialnetworkRouter from './routers/socialnetworkRouter.js';
 import forumRouter from './routers/forumRouter.js';
 import falukantRouter from './routers/falukantRouter.js';
 import friendshipRouter from './routers/friendshipRouter.js';
+import modelsProxyRouter from './routers/modelsProxyRouter.js';
 import blogRouter from './routers/blogRouter.js';
 import match3Router from './routers/match3Router.js';
 import taxiRouter from './routers/taxiRouter.js';
@@ -74,6 +75,7 @@ app.use('/api/vocab', vocabRouter);
 app.use('/api/forum', forumRouter);
 app.use('/api/falukant', falukantRouter);
 app.use('/api/friendships', friendshipRouter);
+app.use('/api/models', modelsProxyRouter);
 app.use('/api/blog', blogRouter);
 app.use('/api/termine', termineRouter);