fix(tradein): cian newbuilding MFE/reliability drift — initialState extraction (#972)

Cian переименовал MFE ЖК-карточки и переместил reliability-контейнер, из-за чего
fetch_newbuilding получал initialState=None → failed_fetch для всех домов
(verified live 2026-06-15 на прод-браузере через мобильный egress):

- MFE: 'newbuilding-card-desktop-fichering-frontend' → 'newbuilding-card-desktop-frontend'
  (старое имя на странице отсутствует → extract_state=None → backfill succeeded=0)
- reliability: initialState.reliability → initialState.reliabilityState.reliability
  (inner dict сохранил форму {checkStatus, details[], banner, actions})

Проверено на ЖК «Светлый» (nb 17556): newbuilding.id, realtyValuation chart (27 точек),
reliabilityState.reliability.checkStatus + 2 details — всё извлекается.

test_fetch_newbuilding_parses_state: fixture обновлён под reliabilityState.reliability.
Полный suite зелёный (1779 passed; 2 несвязанных env-only локальных падения —
cian_valuation cache / search_api auth — в CI проходят).

Refs #972

tradein-mvp/backend/app/services/scrapers/cian_newbuilding.py

@@ -1,12 +1,12 @@
 """Cian.ru newbuilding (ЖК) catalog page scraper.
 
 URL: https://zhk-<slug>-<city>-i.cian.ru/
-MFE: 'newbuilding-card-desktop-fichering-frontend', key: 'initialState'
+MFE: 'newbuilding-card-desktop-frontend', key: 'initialState'
 
 Sister state containers extracted from same MFE initialState top-level keys:
 - realtyValuation: 7-month price chart (data.priceDynamics.chart.data.{labels,values})
   → houses_price_dynamics
-- reliability: наш.дом.рф checkStatus + details[] → house_reliability_checks
+- reliabilityState.reliability: наш.дом.рф checkStatus + details[] → house_reliability_checks
 - offers: grouped by roomType (fromDeveloperRooms[].layouts[])
 - reviews: house reviews list
 - housesByTurn: корпуса по очередям (stored as jsonb on houses)
@@ -140,7 +140,9 @@ async def fetch_newbuilding(
     async with BrowserFetcher() as browser:
         html = await browser.fetch(zhk_url)
 
-    mfe = "newbuilding-card-desktop-fichering-frontend"
+    # Cian ЖК-карточка: MFE 'newbuilding-card-desktop-frontend', key 'initialState'
+    # (verified live 2026-06-15).
+    mfe = "newbuilding-card-desktop-frontend"
 
     nb_state = extract_state(html, mfe=mfe, key="initialState")
     if nb_state is None:
@@ -185,8 +187,9 @@ async def fetch_newbuilding(
         result.realty_valuation_chart = _extract_chart(rv_state)
         result.raw_sister_states["realtyValuation"] = rv_state
 
-    # reliability (наш.дом.рф) — located at initialState.reliability (sec 15.6)
-    rel_state = top.get("reliability") or mfe_states.get("reliability")
+    # reliability (наш.дом.рф) — initialState.reliabilityState.reliability
+    # ({checkStatus, details[], banner, actions}, verified live 2026-06-15).
+    rel_state = (top.get("reliabilityState") or {}).get("reliability")
     if rel_state and isinstance(rel_state, dict):
         result.reliability_checks = _extract_reliability_checks(rel_state)
         result.raw_sister_states["reliability"] = rel_state

tradein-mvp/backend/tests/test_cian_newbuilding.py

@@ -343,9 +343,11 @@ async def test_fetch_newbuilding_parses_state(monkeypatch):
                 }
             }
         },
-        "reliability": {
-            "checkStatus": {"status": "reliable", "title": "Проверено"},
-            "details": [{"type": "problemHousesRegistry", "iconType": "success"}],
+        "reliabilityState": {
+            "reliability": {
+                "checkStatus": {"status": "reliable", "title": "Проверено"},
+                "details": [{"type": "problemHousesRegistry", "iconType": "success"}],
+            },
         },
     }