fix(backend): corrige formatage ruff et typage mypy sur sites/current

CI en échec sur ruff format (ligne trop longue) et mypy (retour Any non
annoté, assignation Literal non étroite). Corrige sans changer le
comportement.

apps/backend/app/api/v1/endpoints/sites.py

@@ -42,9 +42,7 @@ async def get_site(site_id: str, _: LecteurDep, service: SiteServiceDep) -> Site
     summary="Dernière mesure d'un site",
     responses=REPONSES_INTROUVABLE,
 )
-async def get_current(
-    site_id: str, _: LecteurDep, service: SiteServiceDep
-) -> SiteCurrentResponse:
+async def get_current(site_id: str, _: LecteurDep, service: SiteServiceDep) -> SiteCurrentResponse:
     try:
         actuel = await service.current(site_id)
     except SiteNotFoundError as erreur:

apps/backend/app/repositories/reading.py

@@ -27,4 +27,5 @@ class ReadingRepository:
             .order_by(Reading.timestamp.desc())
             .limit(1)
         )
-        return await self._session.scalar(requete)
+        lecture: Reading | None = await self._session.scalar(requete)
+        return lecture

apps/backend/app/services/site.py

@@ -70,9 +70,9 @@ class SiteService:
                 data_quality="critical",
             )
 
-        qualite: DataQuality = (
-            derniere.data_quality if derniere.data_quality in QUALITES_CONNUES else "critical"
-        )
+        qualite: DataQuality = "critical"
+        if derniere.data_quality in QUALITES_CONNUES:
+            qualite = derniere.data_quality  # type: ignore[assignment]
         return SiteCurrentReading(
             timestamp=derniere.timestamp,
             site_id=site.site_id,

apps/backend/tests/services/test_site.py

@@ -54,9 +54,7 @@ class FauxDepotLectures:
         return self._lectures.get(site_id)
 
 
-def service(
-    sites: list[Site], lectures: dict[str, FauxLecture] | None = None
-) -> SiteService:
+def service(sites: list[Site], lectures: dict[str, FauxLecture] | None = None) -> SiteService:
     return SiteService(
         sites=FakeRepository(sites),  # type: ignore[arg-type]
         readings=FauxDepotLectures(lectures or {}),  # type: ignore[arg-type]