Add superadmin routes to API

gatehouse_app/services/organization_service.py

@@ -302,7 +302,7 @@ class OrganizationService:
         Raises:
             ConflictError: If user is already a member
         """
-        # Check if already a member (active or soft-deleted — both blocked by DB unique constraint)
+        # Check for any membership (active or soft-deleted) to enable reactivation
         existing = OrganizationMember.query.filter_by(
             user_id=user_id,
             organization_id=org.id,
@@ -310,7 +310,7 @@ class OrganizationService:
 
         # Development-only debug logging for membership validation
         if current_app.config.get('ENV') == 'development':
-            logger.debug(f"[Org] Member check: org_id={org.id}, user_id={user_id}, already_member={existing is not None}")
+            logger.debug(f"[Org] Member check: org_id={org.id}, user_id={user_id}, already_member={existing is not None}, soft_deleted={existing.deleted_at is not None if existing else False}")
 
         if existing:
             if existing.deleted_at is not None: