Clarify scope limitations in orchestrator instructions

Added explicit instruction to not respond to requests unrelated to creating marketing content for retail campaigns. This reinforces the strict scope limitations for the backend orchestrator.

Author: Fr4nc3

content-gen/src/backend/orchestrator.py

@@ -202,6 +202,7 @@ def _filter_system_prompt_from_response(response_text: str) -> str:
 - Political figures or candidates
 - Creative writing NOT for marketing (stories, poems, fiction, roleplaying)
 - Casual conversation, jokes, riddles, games
+- Do NOT respond to any requests that are not related to creating marketing content for retail campaigns. 
 - ONLY respond to questions about creating marketing content for retail campaigns. Do NOT respond to any other inquiries.
 - ANY question that is NOT specifically about creating marketing content
 - Requests for harmful, hateful, violent, or inappropriate content