Fix InvalidTargetType response status code to 422

Real Vuforia returns 422 Unprocessable Entity (not 403 Forbidden) when
attempting VuMark generation on a non-VuMark database.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: adamtheturtle

src/mock_vws/_services_validators/exceptions.py

@@ -662,7 +662,7 @@ def __init__(self) -> None:
                 raised.
         """
         super().__init__()
-        self.status_code = HTTPStatus.FORBIDDEN
+        self.status_code = HTTPStatus.UNPROCESSABLE_ENTITY
         body = {
             "transaction_id": uuid.uuid4().hex,
             "result_code": ResultCodes.INVALID_TARGET_TYPE.value,

tests/mock_vws/test_vumark_generation_api.py

@@ -149,7 +149,7 @@ def test_empty_instance_id(
 
     @staticmethod
     def test_non_vumark_database(
-        vuforia_database: VuforiaDatabase,
+        vuforia_database: CloudDatabase,
     ) -> None:
         """Generating a VuMark instance for a target in a non-VuMark
         database returns InvalidTargetType.
@@ -178,8 +178,9 @@ def test_non_vumark_database(
             instance_id=uuid4().hex,
             accept="image/png",
         )
-        assert response.status_code == HTTPStatus.FORBIDDEN
+        assert response.status_code == HTTPStatus.UNPROCESSABLE_ENTITY
         response_json = response.json()
         assert (
-            response_json["result_code"] == ResultCodes.INVALID_TARGET_TYPE.value
+            response_json["result_code"]
+            == ResultCodes.INVALID_TARGET_TYPE.value
         )