Fix: fix memcube path bug for docker and change further question prompt

src/memos/mem_os/product.py

@@ -630,7 +630,7 @@ def user_register(
 
             # Create a default cube for the user using MOSCore's methods
             default_cube_name = f"{user_name}_{user_id}_default_cube"
-            mem_cube_name_or_path = f"{CUBE_PATH}/{default_cube_name}"
+            mem_cube_name_or_path = os.path.join(CUBE_PATH, default_cube_name)
             default_cube_id = self.create_cube_for_user(
                 cube_name=default_cube_name, owner_id=user_id, cube_path=mem_cube_name_or_path
             )

src/memos/templates/mos_prompts.py

@@ -203,11 +203,12 @@
 FURTHER_SUGGESTION_PROMPT = """
 You are a helpful assistant.
 You are given a dialogue between a user and a assistant.
-You need to suggest a further question based on the dialogue.
+You need to suggest a further user query based on the dialogue.
 Requirements:
 1. The further question should be related to the dialogue.
 2. The further question should be concise and accurate.
 3. You must return ONLY a valid JSON object. Do not include any other text, explanations, or formatting.
+4. The further question should be generated by the user viewpoint and think of yourself as the user
 the lastest dialogue is:
 {dialogue}
 output should be a json format, the key is "query", the value is a list of suggestion query.