Update process_engagement method to use EngagementFeedback type for engagement parameter

Author: smirk-dev

services/api-python/app/services/educational.py

@@ -170,7 +170,7 @@ async def get_item_basic(self, item_id: str) -> Optional[Dict]:
         """Get basic item information."""
         return {"item_id": item_id, "exists": True}
 
-    async def process_engagement(self, item_id: str, engagement: Dict) -> Dict:
+    async def process_engagement(self, item_id: str, engagement: EngagementFeedback) -> Dict:
         """Process user engagement feedback."""
         try:
             logger.info(f"👍 Processing engagement for item: {item_id}")