feat:截断优化

plugins/AIChat/main.py

@@ -888,7 +888,16 @@ class AIChat(PluginBase):
             max_chars = 0
 
         if max_chars and max_chars > 0 and cleaned and len(cleaned) > max_chars:
-            cleaned = cleaned[:max_chars].rstrip()
+            trimmed = cleaned[:max_chars].rstrip()
+            # 尽量在句末截断，避免半句被硬切（仍保证不超过上限）
+            cut_idx = -1
+            for ch in ("。", "！", "？", "!", "?", "\n"):
+                idx = trimmed.rfind(ch)
+                if idx > cut_idx:
+                    cut_idx = idx
+            if cut_idx >= max_chars * 0.5:
+                trimmed = trimmed[:cut_idx + 1].rstrip()
+            cleaned = trimmed
 
         if cleaned:
             return cleaned