feat: 增加测试覆盖率并优化代码质量

test: 添加单元测试和端到端测试
refactor: 重构登录页面和上传模块
ci: 更新测试覆盖率阈值至42%
build: 添加测试相关依赖
docs: 更新测试文档
style: 修复代码格式问题

jest.config.js

@@ -11,10 +11,10 @@ module.exports = {
   ],
   coverageThreshold: {
     global: {
-      branches: 25,
-      functions: 30,
-      lines: 30,
-      statements: 30,
+      branches: 30,
+      functions: 40,
+      lines: 42,
+      statements: 42,
     },
   },
   coverageReporters: ['text', 'lcov', 'html', 'json'],