v0.5.0: 3 стенда — изоляция состояния, WSGI middleware, OpenAPI server selector, POLYGON_STANDS env

- loader.py: STANDS dict, get_services/get_ops_index per stand, POLYGON_STANDS env
- mock_state.py: get_state(stand_id) — ленивая инициализация
- app.py: StandMiddleware — перезапись PATH_INFO до Flask-роутинга
- Все роуты: LocalProxy(state), LocalProxy(SERVICES/OPS_INDEX) через g.stand_id
- openapi.py: _build_servers() — по одному серверу на стенд
- services/stand{1,2,3}/ — 37 YAML на стенд из STANDS/dev и STANDS/test
- tests/test_api.py: +4 multi-stand теста (изоляция, fail-next, OpenAPI servers)
- Обратная совместимость: /api/v1/svc/... → стенд по умолчанию

site/services/stand1/27_vc_vm_v2.yaml

@@ -0,0 +1,52 @@
+name: vc_vm_v2
+service_id: 27
+service_display_name: VM в Cloud Director (vc_vmV2)
+service_short_name: vc_vm_v2
+lifecycle:
+  suspendOnDestroyDefault: true
+  adoptExistingOnCreateDefault: false
+operations:
+- svcOperationId: 100
+  operation: create
+  kind: instance
+  action: create
+- svcOperationId: 101
+  operation: delete
+  kind: instance
+  action: delete
+- svcOperationId: 104
+  operation: modify
+  kind: instance
+  action: modify
+- svcOperationId: 102
+  operation: resume
+  kind: instance
+  action: resume
+- svcOperationId: 103
+  operation: suspend
+  kind: instance
+  action: suspend
+stateOut: {}
+cfsParams:
+- svcOperationCfsParamId: 301
+  svcOperationCfsParam: serverListJson
+  dataType: json
+  isRequired: true
+  defaultValue: '[{}]'
+  isModifiable: true
+- svcOperationCfsParamId: 302
+  svcOperationCfsParam: serverListJson
+  dataType: json
+  isRequired: true
+  defaultValue: '[{}]'
+  isModifiable: true
+cfsParamsByOp:
+  100:
+  - 301
+  101: []
+  104:
+  - 302
+  102: []
+  103: []
+stateParams:
+  serverListJson: '[{}]'