increase xiaoniu prompt context window to 30 messages

plugins/ai_auto_response/context_builder.py

@@ -4,6 +4,9 @@ from typing import Dict, List
 
 
 class ContextBuilder:
+    def __init__(self, recent_context_size: int = 30):
+        self.recent_context_size = max(int(recent_context_size or 30), 1)
+
     def build(
         self,
         *,
@@ -20,7 +23,7 @@ class ContextBuilder:
         vector_memories: List[Dict],
     ) -> Dict:
         recent_lines = []
-        for item in recent_messages[-8:]:
+        for item in recent_messages[-self.recent_context_size:]:
             msg_sender = item.get("sender_name") or item.get("sender") or "未知成员"
             msg_content = item.get("content") or item.get("message") or ""
             if msg_content: