Feature/memory work (#68)

* feat(memory): add conversation title to conversation list response for frontend display

* feat(memory): optimize conversation retrieval, enable working memory to return conversation question summaries

* fix(memory): fix conversation re-generation logic

* style(desc): improve description of get_conversation function

api/app/schemas/conversation_schema.py

@@ -89,7 +89,7 @@ class ChatResponse(BaseModel):
 # ---------- Conversation Summary Schemas ----------
 class ConversationOut(BaseModel):
     theme: str
-    theme_intro: str
+    question: list[str]
     summary: str
     takeaways: list[str]
     info_score: int