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/strnum/package.json

@@ -0,0 +1,31 @@
+{
+  "name": "strnum",
+  "version": "2.1.2",
+  "description": "Parse String to Number based on configuration",
+  "type": "module",
+  "main": "strnum.js",
+  "scripts": {
+    "test": "jasmine strnum.test.js"
+  },
+  "keywords": [
+    "string",
+    "number",
+    "parse",
+    "convert"
+  ],
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/NaturalIntelligence/strnum"
+  },
+  "author": "Amit Gupta (https://amitkumargupta.work/)",
+  "license": "MIT",
+  "funding": [
+    {
+      "type": "github",
+      "url": "https://github.com/sponsors/NaturalIntelligence"
+    }
+  ],
+  "devDependencies": {
+    "jasmine": "^5.6.0"
+  }
+}