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/routes/index.js

@@ -0,0 +1,90 @@
+/**
+ * 路由模块索引
+ *
+ * 本项目的路由目前主要定义在 server.js 中。
+ * 此目录用于未来路由拆分的模块化重构。
+ *
+ * 建议的路由模块拆分方案：
+ *
+ * 1. routes/health.js - 健康检查和公共配置
+ *    - GET /api/health
+ *    - GET /api/config
+ *    - GET /api/public/theme
+ *
+ * 2. routes/auth.js - 认证相关
+ *    - POST /api/login
+ *    - POST /api/register
+ *    - POST /api/logout
+ *    - POST /api/refresh-token
+ *    - POST /api/password/forgot
+ *    - POST /api/password/reset
+ *    - GET /api/verify-email
+ *    - POST /api/resend-verification
+ *    - GET /api/captcha
+ *    - GET /api/csrf-token
+ *
+ * 3. routes/user.js - 用户相关
+ *    - GET /api/user/profile
+ *    - GET /api/user/theme
+ *    - POST /api/user/theme
+ *    - POST /api/user/update-oss
+ *    - POST /api/user/test-oss
+ *    - GET /api/user/oss-usage
+ *    - POST /api/user/change-password
+ *    - POST /api/user/update-username
+ *    - POST /api/user/switch-storage
+ *
+ * 4. routes/files.js - 文件操作
+ *    - GET /api/files
+ *    - POST /api/files/rename
+ *    - POST /api/files/mkdir
+ *    - POST /api/files/folder-info
+ *    - POST /api/files/delete
+ *    - GET /api/files/upload-signature
+ *    - POST /api/files/upload-complete
+ *    - GET /api/files/download-url
+ *    - GET /api/files/download
+ *    - POST /api/upload
+ *
+ * 5. routes/share.js - 分享功能
+ *    - POST /api/share/create
+ *    - GET /api/share/my
+ *    - DELETE /api/share/:id
+ *    - GET /api/share/:code/theme
+ *    - POST /api/share/:code/verify
+ *    - POST /api/share/:code/list
+ *    - POST /api/share/:code/download
+ *    - GET /api/share/:code/download-url
+ *    - GET /api/share/:code/download-file
+ *
+ * 6. routes/admin.js - 管理员功能
+ *    - GET /api/admin/settings
+ *    - POST /api/admin/settings
+ *    - POST /api/admin/settings/test-smtp
+ *    - GET /api/admin/health-check
+ *    - GET /api/admin/storage-stats
+ *    - GET /api/admin/users
+ *    - GET /api/admin/logs
+ *    - GET /api/admin/logs/stats
+ *    - POST /api/admin/logs/cleanup
+ *    - POST /api/admin/users/:id/ban
+ *    - DELETE /api/admin/users/:id
+ *    - POST /api/admin/users/:id/storage-permission
+ *    - GET /api/admin/users/:id/files
+ *    - GET /api/admin/shares
+ *    - DELETE /api/admin/shares/:id
+ *    - GET /api/admin/check-upload-tool
+ *    - POST /api/admin/upload-tool
+ *
+ * 使用示例（在 server.js 中）：
+ * ```javascript
+ * const healthRoutes = require('./routes/health');
+ * app.use('/api', healthRoutes);
+ * ```
+ */
+
+const healthRoutes = require('./health');
+
+module.exports = {
+  healthRoutes
+};