fix(ltm): trim raw_records in handle_message to prevent unbounded growth

Author: RC-CHN

astrbot/builtin_stars/astrbot/long_term_memory.py

@@ -247,6 +247,9 @@ async def handle_message(self, event: AstrMessageEvent) -> None:
             final_message = "".join(parts)
             logger.debug(f"ltm | {umo} | {final_message}")
             self.raw_records[umo].append(final_message)
+            self._trim_raw_records(
+                umo, max_bytes=cfg.get("ltm_raw_records_max_bytes", MAX_RAW_BYTES)
+            )
 
     # =========================================================================
     # LLM 请求前（on_llm_request 钩子 → decorate_llm_req 调用）