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/mixins.py

@@ -13,7 +13,7 @@ from django.http import (
 )
 from django.views.generic import DetailView
 
-from .models import EditSubmission, PhotoSubmission, UserType
+from .models import EditSubmission, UserType
 
 User = get_user_model()
 
@@ -146,6 +146,8 @@ class EditSubmissionMixin(DetailView):
 class PhotoSubmissionMixin(DetailView):
     """
     Mixin for handling photo submissions with proper moderation.
+    
+    Photos are now handled via EditSubmission with submission_type='PHOTO'.
     """
 
     model: type[models.Model] | None = None
@@ -177,19 +179,25 @@ class PhotoSubmissionMixin(DetailView):
 
         content_type = ContentType.objects.get_for_model(obj)
 
-        submission = PhotoSubmission(
+        # Create EditSubmission with PHOTO type
+        submission = EditSubmission(
             user=request.user,
             content_type=content_type,
             object_id=getattr(obj, "id", None),
+            submission_type="PHOTO",
+            changes={},  # No field changes for photos
             photo=request.FILES["photo"],
             caption=request.POST.get("caption", ""),
             date_taken=request.POST.get("date_taken"),
+            reason="Photo submission",
         )
 
         # Auto-approve for moderators and above
         user_role = getattr(request.user, "role", None)
         if user_role in ["MODERATOR", "ADMIN", "SUPERUSER"]:
-            submission.auto_approve()
+            submission.save()
+            submission.claim(user=request.user)
+            submission.approve(cast(UserType, request.user))
             return JsonResponse(
                 {
                     "status": "success",