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/lodash/_copySymbolsIn.js

@@ -0,0 +1,16 @@
+var copyObject = require('./_copyObject'),
+    getSymbolsIn = require('./_getSymbolsIn');
+
+/**
+ * Copies own and inherited symbols of `source` to `object`.
+ *
+ * @private
+ * @param {Object} source The object to copy symbols from.
+ * @param {Object} [object={}] The object to copy symbols to.
+ * @returns {Object} Returns `object`.
+ */
+function copySymbolsIn(source, object) {
+  return copyObject(source, getSymbolsIn(source), object);
+}
+
+module.exports = copySymbolsIn;