refine xiaoniu natural name mentions

plugins/ai_auto_response/context_builder.py

@@ -37,6 +37,7 @@ class ContextBuilder:
                 "display_name": sender_name,
                 "member_context": member_context or {},
             },
+            "speaker_name_clean": self._clean_display_name(sender_name),
             "recent_messages": recent_lines,
             "recent_summary": "",
             "trigger_type": trigger.get("trigger_type", "none"),
@@ -50,6 +51,17 @@ class ContextBuilder:
             "current_message": f"{sender_name}: {content}",
         }
 
+    @staticmethod
+    def _clean_display_name(sender_name: str) -> str:
+        import re
+
+        text = str(sender_name or "").strip()
+        if not text:
+            return ""
+        text = re.sub(r"\s+", "", text)
+        text = re.sub(r"[^\u4e00-\u9fffA-Za-z0-9_]", "", text)
+        return text[:8]
+
     @staticmethod
     def _build_member_memory_prompt(member_context: Dict) -> str:
         if not member_context: