fix(nlu): relabel move-to-shop purchase requests as trade

nlu_engine.py

@@ -133,15 +133,17 @@ class NLUEngine:
         result = self._llm_parse(user_input)
 
         # 如果 LLM 解析失败，使用关键词降级
-        if result is None:
-            logger.warning("LLM 解析失败，使用关键词降级")
-            result = self._keyword_fallback(user_input)
-
-        # 附加原始输入
-        result["raw_input"] = user_input
-
-        logger.info(f"NLU 解析结果: {result}")
-        return result
+        if result is None:
+            logger.warning("LLM 解析失败，使用关键词降级")
+            result = self._keyword_fallback(user_input)
+
+        result = self._apply_intent_postprocessing(result, user_input)
+
+        # 附加原始输入
+        result["raw_input"] = user_input
+
+        logger.info(f"NLU 解析结果: {result}")
+        return result
 
     def _llm_parse(self, user_input: str) -> Optional[dict]:
         """
@@ -239,10 +241,10 @@ class NLUEngine:
             "parser_source": "keyword_fallback",
         }
 
-    def _extract_target_from_text(self, text: str) -> Optional[str]:
-        """
-        从文本中提取可能的目标对象。
-        尝试匹配当前场景中的 NPC、物品、地点名称。
+    def _extract_target_from_text(self, text: str) -> Optional[str]:
+        """
+        从文本中提取可能的目标对象。
+        尝试匹配当前场景中的 NPC、物品、地点名称。
         """
         # 检查 NPC 名称
         for npc_name in self.game_state.world.npcs:
@@ -265,12 +267,39 @@ class NLUEngine:
         for item_name in self.game_state.world.item_registry:
             if item_name in text:
                 return item_name
-
-        return None
-
-    def _build_context(self) -> str:
-        """构建当前场景的简要上下文描述"""
-        gs = self.game_state
+
+        return None
+
+    def _apply_intent_postprocessing(self, result: dict, user_input: str) -> dict:
+        """Apply narrow intent corrections for high-confidence mixed phrases."""
+        normalized = dict(result)
+        intent = str(normalized.get("intent", "")).upper()
+        if intent == "MOVE" and self._looks_like_trade_request(user_input, normalized.get("target")):
+            normalized["intent"] = "TRADE"
+            normalized["intent_correction"] = "move_to_trade_for_shop_request"
+        return normalized
+
+    def _looks_like_trade_request(self, user_input: str, target: Optional[str]) -> bool:
+        trade_pattern = r"买|卖|交易|购买|出售|看看有什么卖的|买点"
+        if not re.search(trade_pattern, user_input):
+            return False
+
+        target_text = str(target or "")
+        if target_text:
+            npc = self.game_state.world.npcs.get(target_text)
+            if npc and npc.can_trade:
+                return True
+
+            location = self.game_state.world.locations.get(target_text)
+            if location and location.shop_available:
+                return True
+
+        shop_hint_pattern = r"商店|杂货铺|旅店|铁匠铺"
+        return bool(re.search(shop_hint_pattern, user_input))
+
+    def _build_context(self) -> str:
+        """构建当前场景的简要上下文描述"""
+        gs = self.game_state
         return (
             f"场景: {gs.world.current_scene}\n"
             f"时间: 第{gs.world.day_count}天 {gs.world.time_of_day}\n"