fix: 添加资源释放幂等保护

- 添加 _released 标志防止重复释放
- release() 方法支持幂等调用

core/tensorrt_engine.py

@@ -49,6 +49,7 @@ class TensorRTEngine:
         self._input_binding = None
         self._output_bindings = []
         self._stream = None
+        self._released = False
         
         self._logger = get_logger("tensorrt")
         self._lock = threading.Lock()
@@ -348,8 +349,12 @@ class TensorRTEngine:
         self._memory_pool.clear()
     
     def release(self):
-        """释放引擎资源"""
+        """释放引擎资源（幂等调用）"""
         with self._lock:
+            if self._released:
+                return
+            self._released = True
+            
             self._release_resources()
             self._logger.info("TensorRT引擎资源已释放")