v1.1.55: split large files + CRUD scenario editor
Backend (5→7 files):
- api_test.py: 622→479, terraform functions → operations/terraform.py (142)
- api_scenario.py: 241→split into run (153) + defs (108) with _validate_steps()
- db/scenario_defs.py: +client_id, stand, is_seed in list_definitions
Frontend (1→10 files):
- app.js: 554→16 (loader), split into:
utils.js (45), instances.js (89), operations.js (249),
history.js (35), scenario-list.js (90)
- New CRUD: scenario-form.js (128), create (25), edit (12), delete (13)
Max file size: JS 249, PY 479