fix: persist account ownership for script templates and generations

backend/app/api/endpoints/scripts.py

@@ -197,6 +197,7 @@ async def create_template(
     template = ScriptTemplate(
         category_id=data.category_id,
         team_id=current_user.team_id,
+        account_id=current_user.account_id,
         created_by=current_user.id,
         name=data.name,
         slug=slug,
@@ -364,6 +365,7 @@ async def generate_script(
     generation = ScriptGeneration(
         template_id=template.id,
         user_id=current_user.id,
+        account_id=current_user.account_id,
         team_id=current_user.team_id,
         session_id=data.session_id,
         ai_session_id=data.ai_session_id,