feat: 添加多项功能和修复

功能新增:
- OSS 存储使用情况显示（文件页面）
- OSS 当日流量统计（阿里云云监控API）
- 分享页面路由修复（/s/xxx 格式支持）

Bug修复:
- 修复分享页面资源路径（相对路径改绝对路径）
- 修复分享码获取逻辑（支持路径格式）
- 修复OSS配额undefined显示问题
- 修复登录流程OSS配置检查
- 修复文件数为null时的显示问题

依赖更新:
- 添加 @alicloud/cms20190101 云监控SDK
- 添加 @alicloud/openapi-client

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/node_modules/xml2js/lib/xml2js.js

@@ -0,0 +1,39 @@
+// Generated by CoffeeScript 1.12.7
+(function() {
+  "use strict";
+  var builder, defaults, parser, processors,
+    extend = function(child, parent) { for (var key in parent) { if (hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; },
+    hasProp = {}.hasOwnProperty;
+
+  defaults = require('./defaults');
+
+  builder = require('./builder');
+
+  parser = require('./parser');
+
+  processors = require('./processors');
+
+  exports.defaults = defaults.defaults;
+
+  exports.processors = processors;
+
+  exports.ValidationError = (function(superClass) {
+    extend(ValidationError, superClass);
+
+    function ValidationError(message) {
+      this.message = message;
+    }
+
+    return ValidationError;
+
+  })(Error);
+
+  exports.Builder = builder.Builder;
+
+  exports.Parser = parser.Parser;
+
+  exports.parseString = parser.parseString;
+
+  exports.parseStringPromise = parser.parseStringPromise;
+
+}).call(this);