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/append-field/package.json

@@ -0,0 +1,19 @@
+{
+  "name": "append-field",
+  "version": "1.0.0",
+  "license": "MIT",
+  "author": "Linus Unnebäck <linus@folkdatorn.se>",
+  "main": "index.js",
+  "devDependencies": {
+    "mocha": "^2.2.4",
+    "standard": "^6.0.5",
+    "testdata-w3c-json-form": "^0.2.0"
+  },
+  "scripts": {
+    "test": "standard && mocha"
+  },
+  "repository": {
+    "type": "git",
+    "url": "http://github.com/LinusU/node-append-field.git"
+  }
+}