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/smithy-client/dist-es/serde-json.js

@@ -0,0 +1,19 @@
+export const _json = (obj) => {
+    if (obj == null) {
+        return {};
+    }
+    if (Array.isArray(obj)) {
+        return obj.filter((_) => _ != null).map(_json);
+    }
+    if (typeof obj === "object") {
+        const target = {};
+        for (const key of Object.keys(obj)) {
+            if (obj[key] == null) {
+                continue;
+            }
+            target[key] = _json(obj[key]);
+        }
+        return target;
+    }
+    return obj;
+};