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/XMLProcessingInstruction.js

@@ -0,0 +1,49 @@
+// Generated by CoffeeScript 1.12.7
+(function() {
+  var NodeType, XMLCharacterData, XMLProcessingInstruction,
+    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;
+
+  NodeType = require('./NodeType');
+
+  XMLCharacterData = require('./XMLCharacterData');
+
+  module.exports = XMLProcessingInstruction = (function(superClass) {
+    extend(XMLProcessingInstruction, superClass);
+
+    function XMLProcessingInstruction(parent, target, value) {
+      XMLProcessingInstruction.__super__.constructor.call(this, parent);
+      if (target == null) {
+        throw new Error("Missing instruction target. " + this.debugInfo());
+      }
+      this.type = NodeType.ProcessingInstruction;
+      this.target = this.stringify.insTarget(target);
+      this.name = this.target;
+      if (value) {
+        this.value = this.stringify.insValue(value);
+      }
+    }
+
+    XMLProcessingInstruction.prototype.clone = function() {
+      return Object.create(this);
+    };
+
+    XMLProcessingInstruction.prototype.toString = function(options) {
+      return this.options.writer.processingInstruction(this, this.options.writer.filterOptions(options));
+    };
+
+    XMLProcessingInstruction.prototype.isEqualNode = function(node) {
+      if (!XMLProcessingInstruction.__super__.isEqualNode.apply(this, arguments).isEqualNode(node)) {
+        return false;
+      }
+      if (node.target !== this.target) {
+        return false;
+      }
+      return true;
+    };
+
+    return XMLProcessingInstruction;
+
+  })(XMLCharacterData);
+
+}).call(this);