fix(ts): 修复TypeScript类型错误

1. playwright.config.ts:
   - 添加类型断言 'fast' | 'standard' | 'deep'
   - 为tierConfig添加明确的Record类型
   - 移除不必要的fallback

2. test-data-cleaner.ts:
   - 修复Object is possibly 'undefined'错误
   - 添加可选链和空值检查

src/test-utils/test-data-cleaner.ts

@@ -71,8 +71,11 @@ export class TestDataCleaner {
   static clearCookies(): void {
     if (typeof document !== 'undefined' && document.cookie) {
       document.cookie.split(';').forEach(cookie => {
-        const name = cookie.split('=')[0].trim();
-        document.cookie = `${name}=; expires=Thu, 01 Jan 1970 00:00:00 GMT; path=/`;
+        const parts = cookie.split('=');
+        const name = parts[0]?.trim();
+        if (name) {
+          document.cookie = `${name}=; expires=Thu, 01 Jan 1970 00:00:00 GMT; path=/`;
+        }
       });
     }
   }