Revert "fix prompt error" (#452)

Revert "fix prompt error (#447)"

This reverts commit 4c8f89a.

Author: CaralHsi

src/memos/graph_dbs/polardb.py

@@ -3028,7 +3028,7 @@ def format_param_value(self, value: str | None) -> str:
         """Format parameter value to handle both quoted and unquoted formats"""
         # Handle None value
         if value is None:
-            logger.warning("format_param_value: value is None")
+            logger.warning(f"format_param_value: value is None")
             return "null"
 
         # Remove outer quotes if they exist

src/memos/templates/prefer_complete_prompt.py

@@ -599,15 +599,15 @@
 
 PREF_INSTRUCTIONS = """
 # Note:
-Fact memory are summaries of facts, while preference memory are summaries of user preferences.
+Plaintext memory are summaries of facts, while preference memories are summaries of user preferences.
 Your response must not violate any of the user's preferences, whether explicit or implicit, and briefly explain why you answer this way to avoid conflicts.
-When encountering preference conflicts, the priority is: explicit preference > implicit preference > fact memory.
+When encountering preference conflicts, the priority is: explicit preference > implicit preference > plaintext memory.
 """
 
 
 PREF_INSTRUCTIONS_ZH = """
 # 注意：
-事实记忆是事实的摘要，而偏好记忆是用户偏好的摘要。
+明文记忆是事实的摘要，而偏好记忆是用户偏好的摘要。
 你的回复不得违反用户的任何偏好，无论是显式偏好还是隐式偏好，并简要解释你为什么这样回答以避免冲突。
-当遇到偏好冲突时，优先级为：显式偏好 > 隐式偏好 > 事实记忆。
+当遇到偏好冲突时，优先级为：显式偏好 > 隐式偏好 > 明文记忆。
 """