Add male toddler character model in GLB format

backend/services/modelsProxyService.js

@@ -14,6 +14,7 @@ const PROJECT_ROOT = path.join(BACKEND_DIR, '..');
 const MODELS_REL = path.join('models', '3d', 'falukant', 'characters');
 const DIST_MODELS = path.join(PROJECT_ROOT, 'frontend', 'dist', MODELS_REL);
 const PUBLIC_MODELS = path.join(PROJECT_ROOT, 'frontend', 'public', MODELS_REL);
+const SOURCE_MODELS = path.join(PROJECT_ROOT, 'frontend', 'models-src', '3d', 'falukant', 'characters');
 const CACHE_DIR = path.join(BACKEND_DIR, 'data', 'model-cache');
 const CLI_PATH = path.join(BACKEND_DIR, 'node_modules', '.bin', 'gltf-transform');
 
@@ -103,16 +104,17 @@ export async function getOptimizedModelPath(filename) {
     return sourcePath;
   }
 
+  const rawSourcePath = path.join(SOURCE_MODELS, filename);
+  if (!fs.existsSync(rawSourcePath)) {
+    throw new Error(`Raw source model not found: ${filename} (looked in ${SOURCE_MODELS})`);
+  }
+
   const cacheFilename = filename.replace(/\.glb$/, '_opt.glb');
   const cachePath = path.join(CACHE_DIR, cacheFilename);
 
-  if (!fs.existsSync(sourcePath)) {
-    throw new Error(`Source model not found: ${filename} (looked in ${sourceDir})`);
-  }
-
   ensureCacheDir();
 
-  if (isCacheValid(sourcePath, cachePath)) {
+  if (isCacheValid(rawSourcePath, cachePath)) {
     return cachePath;
   }
 
@@ -120,7 +122,7 @@ export async function getOptimizedModelPath(filename) {
   if (!promise) {
     promise = (async () => {
       try {
-        await runOptimize(sourcePath, cachePath);
+        await runOptimize(rawSourcePath, cachePath);
         return cachePath;
       } finally {
         pending.delete(filename);