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/xmlbuilder/lib/XMLStringWriter.js

@@ -0,0 +1,35 @@
+// Generated by CoffeeScript 1.12.7
+(function() {
+  var XMLStringWriter, XMLWriterBase,
+    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;
+
+  XMLWriterBase = require('./XMLWriterBase');
+
+  module.exports = XMLStringWriter = (function(superClass) {
+    extend(XMLStringWriter, superClass);
+
+    function XMLStringWriter(options) {
+      XMLStringWriter.__super__.constructor.call(this, options);
+    }
+
+    XMLStringWriter.prototype.document = function(doc, options) {
+      var child, i, len, r, ref;
+      options = this.filterOptions(options);
+      r = '';
+      ref = doc.children;
+      for (i = 0, len = ref.length; i < len; i++) {
+        child = ref[i];
+        r += this.writeChildNode(child, options, 0);
+      }
+      if (options.pretty && r.slice(-options.newline.length) === options.newline) {
+        r = r.slice(0, -options.newline.length);
+      }
+      return r;
+    };
+
+    return XMLStringWriter;
+
+  })(XMLWriterBase);
+
+}).call(this);