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/@alicloud/endpoint-util/package.json

@@ -0,0 +1,30 @@
+{
+  "name": "@alicloud/endpoint-util",
+  "version": "0.0.1",
+  "description": "",
+  "main": "dist/client.js",
+  "scripts": {
+    "test": "mocha -r ts-node/register -r source-map-support/register test/**/*.spec.ts",
+    "test-cov": "nyc -e .ts -r=html -r=text -r=lcov npm run test",
+    "ci": "npm run test-cov && codecov",
+    "build": "tsc",
+    "prepublishOnly": "tsc"
+  },
+  "author": "Jackson Tian",
+  "license": "Apache-2.0",
+  "devDependencies": {
+    "@types/mocha": "^7.0.1",
+    "@types/node": "^12.12.26",
+    "mocha": "^7.0.1",
+    "ts-node": "^8.6.2",
+    "typescript": "^3.7.5"
+  },
+  "dependencies": {
+    "@alicloud/tea-typescript": "^1.5.1",
+    "kitx": "^2.0.0"
+  },
+  "files": [
+    "dist",
+    "src"
+  ]
+}