v1.2.5: parameter editor with auto-load from API + params-render.js

Phase 1: paramDefsCache, step.params as {name:value}
Phase 2: resolveStepSvcOpId() → loadStepParams() via /api/params
Phase 3: <details> in step card, renderParamRow with pre-fill (clone def + saved values)
Phase 4: snapshotStepParams() before re-render, reset on operation change
Phase 5: collectFormSteps via collectParams() + numeric→name reverse mapping

Only scenario-form.js changed. params-render.js, api_test.py, _resolve_params unchanged.
Compatible with existing scenarios (symbolic names in DB).

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 = "1.2.4"
+VERSION = "1.2.5"
 
 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")