Fix various agent-chat bugs, add qdrant dependency, WIP memory processing for conversation agent

backend/chat.py

@@ -87,7 +87,7 @@ class ChatView:
                         thread = Thread(record.thread_id, self.chat_id)
                         self.thread_map[thread.id] = thread
                         self.threads.insert(0, thread)
-                # This is the oldest message processed, add it to the start of the chat
+                # This is the oldest message so far, add it to the start of the chat
                 message = Message(record.id, record.content, record.sender, record.time)
                 thread.messages.insert(0, message)