重构：完善配置加载机制与初始化逻辑

新增环境变量覆盖机制，增强配置灵活性

优化 bioyond_rpc.py 与 bioyond_cell_workstation.py 的初始化流程与结构

修正 station.py 工作流映射逻辑，确保正确性

提高代码可读性与模块间解耦程度

unilabos/devices/workstation/bioyond_studio/station.py

@@ -165,8 +165,8 @@ class BioyondWorkstation(WorkstationBase):
         self.workflow_sequence = []
         self.pending_task_params = []
 
-        if "workflow_mappings" in bioyond_config:
-            self._set_workflow_mappings(bioyond_config["workflow_mappings"])
+        if self.bioyond_config and "workflow_mappings" in self.bioyond_config:
+            self._set_workflow_mappings(self.bioyond_config["workflow_mappings"])
         logger.info(f"Bioyond工作站初始化完成")
 
     def post_init(self, ros_node: ROS2WorkstationNode):