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/mkdirp-classic/package.json

@@ -0,0 +1,18 @@
+{
+  "name": "mkdirp-classic",
+  "version": "0.5.3",
+  "description": "Mirror of mkdirp 0.5.2",
+  "main": "index.js",
+  "dependencies": {},
+  "devDependencies": {},
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/mafintosh/mkdirp-classic.git"
+  },
+  "author": "Mathias Buus (@mafintosh)",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/mafintosh/mkdirp-classic/issues"
+  },
+  "homepage": "https://github.com/mafintosh/mkdirp-classic"
+}