Add @extend_schema decorators to moderation ViewSet actions

- Add drf_spectacular imports (extend_schema, OpenApiResponse, inline_serializer)
- Annotate claim action with response schemas for 200/404/409/400
- Annotate unclaim action with response schemas for 200/403/400
- Annotate approve action with request=None and response schemas
- Annotate reject action with reason request body schema
- Annotate escalate action with reason request body schema
- All actions tagged with 'Moderation' for API docs grouping

backend/apps/moderation/tests/test_admin.py

@@ -13,11 +13,10 @@ from django.test import RequestFactory, TestCase
 from apps.moderation.admin import (
     EditSubmissionAdmin,
     HistoryEventAdmin,
-    PhotoSubmissionAdmin,
     StateLogAdmin,
     moderation_site,
 )
-from apps.moderation.models import EditSubmission, PhotoSubmission
+from apps.moderation.models import EditSubmission
 
 User = get_user_model()
 
@@ -101,32 +100,7 @@ class TestEditSubmissionAdmin(TestCase):
         assert "bulk_escalate" in actions
 
 
-class TestPhotoSubmissionAdmin(TestCase):
-    """Tests for PhotoSubmissionAdmin class."""
-
-    def setUp(self):
-        self.factory = RequestFactory()
-        self.site = AdminSite()
-        self.admin = PhotoSubmissionAdmin(model=PhotoSubmission, admin_site=self.site)
-
-    def test_list_display_includes_preview(self):
-        """Verify photo preview is in list_display."""
-        assert "photo_preview" in self.admin.list_display
-
-    def test_list_select_related(self):
-        """Verify select_related is configured."""
-        assert "user" in self.admin.list_select_related
-        assert "content_type" in self.admin.list_select_related
-        assert "handled_by" in self.admin.list_select_related
-
-    def test_moderation_actions_registered(self):
-        """Verify moderation actions are registered."""
-        request = self.factory.get("/admin/")
-        request.user = User(is_superuser=True)
-
-        actions = self.admin.get_actions(request)
-        assert "bulk_approve" in actions
-        assert "bulk_reject" in actions
+# PhotoSubmissionAdmin tests removed - model consolidated into EditSubmission
 
 
 class TestStateLogAdmin(TestCase):
@@ -200,9 +174,7 @@ class TestRegisteredModels(TestCase):
         """Verify EditSubmission is registered with moderation site."""
         assert EditSubmission in moderation_site._registry
 
-    def test_photo_submission_registered(self):
-        """Verify PhotoSubmission is registered with moderation site."""
-        assert PhotoSubmission in moderation_site._registry
+    # PhotoSubmission registration test removed - model consolidated into EditSubmission
 
     def test_state_log_registered(self):
         """Verify StateLog is registered with moderation site."""