"Refactor backend configuration and setup for improved maintainability (feat)"

backend/app.py

@@ -1952,19 +1952,7 @@ else:
     
     with app.app_context():
         init_db()
-        printers_config = json.loads(app.config.get('PRINTERS', '{}'))
+        printers_config = app.config.get('PRINTERS', {})
         if printers_config:
             init_printers()
-        setup_frontend_v2()
-
-    # Parse PRINTERS als JSON
-    printers_env = app.config.get('PRINTERS', '{}')
-    if isinstance(printers_env, str):
-        try:
-            app.config['PRINTERS'] = json.loads(printers_env)
-        except (json.JSONDecodeError, TypeError):
-            app.config['PRINTERS'] = {}
-    elif isinstance(printers_env, dict):
-        app.config['PRINTERS'] = printers_env
-    else:
-        app.config['PRINTERS'] = {}
+        setup_frontend_v2()