style: do not clutter the root directory

Author: vil02

.github/workflows/project_structure.yml

@@ -18,5 +18,5 @@ jobs:
           python-version: '3.13'
 
       - name: Check project structure
-        run: python3 check_structure.py
+        run: python3 .github/workflows/scripts/check_structure.py
 ...