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.

frontend/scripts/optimize-glb.mjs

@@ -0,0 +1,45 @@
+#!/usr/bin/env node
+/**
+ * Optimiert Falukant-Charakter-GLBs mit Draco + Textur-Optimierung.
+ * Ausgabe: *_opt.glb im selben Verzeichnis.
+ * Voraussetzung: npm install (@gltf-transform/cli als Dev-Dep)
+ *
+ * Aufruf: npm run optimize-models
+ */
+
+import { execSync } from 'child_process';
+import { fileURLToPath } from 'url';
+import path from 'path';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const charsDir = path.join(__dirname, '..', 'public', 'models', '3d', 'falukant', 'characters');
+
+const models = [
+  'male.glb', 'female.glb',
+  'male_adult.glb', 'male_child.glb', 'male_preteen.glb', 'male_teen.glb', 'male_toddler.glb',
+  'female_adult.glb', 'female_child.glb', 'female_preteen.glb', 'female_teen.glb', 'female_toddler.glb',
+];
+
+const cli = path.join(__dirname, '..', 'node_modules', '.bin', 'gltf-transform');
+const cmd = (input, output) =>
+  `"${cli}" optimize "${input}" "${output}" --compress draco --texture-size 1024`;
+
+console.log('Optimize Falukant character GLBs (Draco + texture 1024)\n');
+
+for (const f of models) {
+  const input = path.join(charsDir, f);
+  const out = f.replace(/\.glb$/, '_opt.glb');
+  const output = path.join(charsDir, out);
+
+  try {
+    execSync(`node "${cli}" optimize "${input}" "${output}" --compress draco --texture-size 1024`, {
+      stdio: 'inherit',
+      cwd: path.join(__dirname, '..'),
+    });
+  } catch (e) {
+    console.error(`Failed: ${f}`);
+    process.exitCode = 1;
+  }
+}
+
+console.log('\nDone. Use *_opt.glb in Character3D (with DRACOLoader).');