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/@aws-crypto/sha1-browser/README.md

@@ -0,0 +1,21 @@
+# @aws-crypto/sha1-browser
+
+SHA1 wrapper for browsers that prefers `window.crypto.subtle`.
+
+SHA1 is **NOT** a cryptographically secure algorithm.
+It should _only_ be used for non cryptographic functions like checksums.
+
+## Usage
+
+```
+import {Sha1} from '@aws-crypto/sha1-browser'
+
+const hash = new Sha1();
+hash.update('some data');
+const result = await hash.digest();
+
+```
+
+## Test
+
+`npm test`