fix: 修正硅基流动供应商标识

- 将错误的 siliconlow 标识统一更正为 siliconflow

- 对齐后端网关、品牌配置和管理端模型列表

easyflow-ui-admin/app/src/views/ai/model/modelUtils/providerList.json

@@ -193,7 +193,7 @@
   },
   {
     "label": "硅基流动",
-    "value": "siliconlow",
+    "value": "siliconflow",
     "description": "聚合多家开源模型能力，适合快速接入主流开源生态。",
     "tags": ["开源模型", "聚合平台", "Embeddings"],
     "mode": "hosted",