feat: add average emotion per topic endpoint

server/stat_gen.py

@@ -192,8 +192,24 @@ class StatGen:
             .reset_index(drop=True)
         )
 
+        # avearge emotion by topic (excluding neutral)
+        emotion_cols = [
+            col for col in self.df.columns
+            if col.startswith("emotion_") and col != "emotion_neutral"
+        ]
+
+        avg_emotion_by_topic = (
+            self.df[
+                (self.df["topic"] != "Misc")
+            ]
+            .groupby("topic")[emotion_cols]
+            .mean()
+            .reset_index()
+        )
+
         return {
-            "word_frequencies": word_frequencies.to_dict(orient='records')
+            "word_frequencies": word_frequencies.to_dict(orient='records'),
+            "average_emotion_by_topic": avg_emotion_by_topic.to_dict(orient='records')
         }
     
     def user_analysis(self) -> dict: