feat: 使用 Playwright 实现自动化 cookie 获取和验证

主要变更:
- 新增 Playwright 登录认证服务 (services/playwright-auth.ts)
- 重构 get-activity.ts 使用 Playwright 替代 Axios 登录
- 实现自动 cookie 过期检测和重试机制
- 优化 Docker 配置支持 Playwright 浏览器运行
- 添加启动脚本自动验证和刷新 cookies
- 完善错误处理：区分 4xx(认证失败) 和 5xx(服务器错误)

技术细节:
- 删除旧版 login_template.txt 和 nkcs-engage.cookie.txt
- 添加 startup.sh 启动时自动验证 cookies
- 改进 cookie 验证逻辑，添加指数退避重试
- Dockerfile 安装 Playwright 系统依赖
- docker-compose.yaml 添加 volumes 和 health checks

测试:
- 添加 auth.spec.ts 自动化测试
- 添加 get-cookies.ts 和 test-cookies-validity.ts 工具脚本
- 验证 401/500/000 等错误场景处理正确

package.json

@@ -3,9 +3,15 @@
   "private": true,
   "scripts": {
     "start": "bun run index.ts",
-    "dev": "bun run --watch index.ts"
+    "dev": "bun run --watch index.ts",
+    "playwright:install": "bunx playwright install",
+    "cookie:get": "bun run test/get-cookies.ts",
+    "test": "bun test",
+    "test:auth": "bun test test/auth.spec.ts",
+    "test:ui": "bunx playwright test --ui"
   },
   "devDependencies": {
+    "@playwright/test": "^1.49.0",
     "@types/bun": "latest",
     "typescript-language-server": "^5.1.3"
   },