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/signature-v4/dist-es/headerUtil.js

@@ -0,0 +1,26 @@
+export const hasHeader = (soughtHeader, headers) => {
+    soughtHeader = soughtHeader.toLowerCase();
+    for (const headerName of Object.keys(headers)) {
+        if (soughtHeader === headerName.toLowerCase()) {
+            return true;
+        }
+    }
+    return false;
+};
+export const getHeaderValue = (soughtHeader, headers) => {
+    soughtHeader = soughtHeader.toLowerCase();
+    for (const headerName of Object.keys(headers)) {
+        if (soughtHeader === headerName.toLowerCase()) {
+            return headers[headerName];
+        }
+    }
+    return undefined;
+};
+export const deleteHeader = (soughtHeader, headers) => {
+    soughtHeader = soughtHeader.toLowerCase();
+    for (const headerName of Object.keys(headers)) {
+        if (soughtHeader === headerName.toLowerCase()) {
+            delete headers[headerName];
+        }
+    }
+};