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/getCanonicalHeaders.js

@@ -0,0 +1,20 @@
+import { ALWAYS_UNSIGNABLE_HEADERS, PROXY_HEADER_PATTERN, SEC_HEADER_PATTERN } from "./constants";
+export const getCanonicalHeaders = ({ headers }, unsignableHeaders, signableHeaders) => {
+    const canonical = {};
+    for (const headerName of Object.keys(headers).sort()) {
+        if (headers[headerName] == undefined) {
+            continue;
+        }
+        const canonicalHeaderName = headerName.toLowerCase();
+        if (canonicalHeaderName in ALWAYS_UNSIGNABLE_HEADERS ||
+            unsignableHeaders?.has(canonicalHeaderName) ||
+            PROXY_HEADER_PATTERN.test(canonicalHeaderName) ||
+            SEC_HEADER_PATTERN.test(canonicalHeaderName)) {
+            if (!signableHeaders || (signableHeaders && !signableHeaders.has(canonicalHeaderName))) {
+                continue;
+            }
+        }
+        canonical[canonicalHeaderName] = headers[headerName].trim().replace(/\s+/g, " ");
+    }
+    return canonical;
+};