fix(api): satisfy mobile category lint

Refs #1

Author: Seungpyo1007

app/validate.py

@@ -175,7 +175,9 @@ def _check_variant_path(
         errors.append(f"{fname}: lives in brand '{brand}' but brand='{rec.get('brand')}'")
     release_year = str(rec.get("release_date", ""))[:4]
     if release_year and year != release_year:
-        errors.append(f"{fname}: lives in year '{year}' but release_date starts with '{release_year}'")
+        errors.append(
+            f"{fname}: lives in year '{year}' but release_date starts with '{release_year}'"
+        )
     if rec.get("base_model_slug") and rec.get("base_model_slug") != base_model_slug:
         errors.append(
             f"{fname}: lives under base '{base_model_slug}' but "

tests/integration/test_mobile_devices.py

@@ -30,7 +30,9 @@ def test_mobile_device_detail_includes_variant_fields(client: TestClient) -> Non
 
 def test_mobile_device_filters(client: TestClient) -> None:
     brand_body = client.get("/v1/watches?brand=samsung").json()
-    assert {item["slug"] for item in brand_body["results"]} == {"galaxy-watch-global-bluetooth-42mm"}
+    assert {item["slug"] for item in brand_body["results"]} == {
+        "galaxy-watch-global-bluetooth-42mm"
+    }
 
     base_body = client.get("/v1/tablets?base_model_slug=ipad-pro-11-m4").json()
     assert {item["slug"] for item in base_body["results"]} == {"ipad-pro-11-m4-wifi-8gb-256gb"}