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/minimatch/dist/esm/escape.d.ts.map

@@ -0,0 +1 @@
+{"version":3,"file":"escape.d.ts","sourceRoot":"","sources":["../../src/escape.ts"],"names":[],"mappings":"AAAA,OAAO,EAAE,gBAAgB,EAAE,MAAM,YAAY,CAAA;AAC7C;;;;;;;;GAQG;AACH,eAAO,MAAM,MAAM,MACd,MAAM,8BAGN,KAAK,gBAAgB,EAAE,sBAAsB,CAAC,WAQlD,CAAA"}