fix(provider): support unversioned API roots in model fetch

frontend/src/features/providers/components/ModelMappingDialog.vue

@@ -322,7 +322,7 @@ const emit = defineEmits<{
   'saved': []
 }>()
 
-const { error: showError, success: showSuccess } = useToast()
+const { error: showError, success: showSuccess, warning: showWarning } = useToast()
 const { fetchModels: fetchCachedModels } = useUpstreamModelsCache()
 
 type EndpointOption = {
@@ -565,7 +565,11 @@ async function fetchUpstreamModels() {
       allCustomNames.value = Array.from(mergedCustom).filter(name => !upstreamIds.has(name))
     }
     if (result.error) {
-      showError(result.error, '获取上游模型失败')
+      if (result.models.length > 0) {
+        showWarning(result.error, '部分格式获取失败')
+      } else {
+        showError(result.error, '获取上游模型失败')
+      }
     }
   } catch (err: unknown) {
     showError(parseApiError(err, '获取上游模型列表失败'), '错误')