v1.2.2: modal scenario editor with dropdowns + output/ref

scenario-form.js — full rewrite:
- Full-screen modal (backdrop + content, 800px max-width)
- Services dropdown (GET /api/services, cached)
- Operations dropdown (GET /api/operations/{svcId}, cached)
- output field for create steps
- instance_ref dropdown (previous outputs) + explicit instance_uid
- [↑][↓] reorder buttons
- Auto-load operations on service change

index.html — modal CSS (#scenario-modal, .modal-backdrop, .modal-content)

site/app.py

@@ -19,7 +19,7 @@ from routes.api_scenario_run import bp_run as api_scenario_run_bp
 from routes.api_scenario_defs import bp_defs as api_scenario_defs_bp
 
 # Версия — меняется при КАЖДОМ изменении кода. Показывается в топбаре UI.
-VERSION = "1.2.1"
+VERSION = "1.2.2"
 
 app = Flask(__name__, template_folder="templates", static_folder="static")
 app.config["NUBES_API_ENDPOINT"] = os.getenv("NUBES_API_ENDPOINT", "https://lk-api-gateway-test.ngcloud.ru/api/v1/svc")