fix: 修复配额说明重复和undefined问题

- 在editStorageForm中初始化oss_storage_quota_value和oss_quota_unit
- 删除重复的旧配额说明块，保留新的当前配额设置显示

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/node_modules/@smithy/credential-provider-imds/dist-es/config/EndpointConfigOptions.js

@@ -0,0 +1,7 @@
+export const ENV_ENDPOINT_NAME = "AWS_EC2_METADATA_SERVICE_ENDPOINT";
+export const CONFIG_ENDPOINT_NAME = "ec2_metadata_service_endpoint";
+export const ENDPOINT_CONFIG_OPTIONS = {
+    environmentVariableSelector: (env) => env[ENV_ENDPOINT_NAME],
+    configFileSelector: (profile) => profile[CONFIG_ENDPOINT_NAME],
+    default: undefined,
+};