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

playwright.config.ts

@@ -1,10 +1,14 @@
 import { defineConfig, devices } from '@playwright/test';
 
 const isCI = !!process.env.CI;
-const testTier = process.env.TEST_TIER || 'standard';
+const testTier = (process.env.TEST_TIER || 'standard') as 'fast' | 'standard' | 'deep';
 const baseURL = process.env.BASE_URL || (isCI ? 'http://localhost:3000' : 'https://novalon.cn');
 
-const tierConfig = {
+const tierConfig: Record<'fast' | 'standard' | 'deep', {
+  timeout: number;
+  retries: number;
+  workers: number | undefined;
+}> = {
   fast: {
     timeout: 15000,
     retries: 0,
@@ -22,7 +26,7 @@ const tierConfig = {
   },
 };
 
-const config = tierConfig[testTier] || tierConfig.standard;
+const config = tierConfig[testTier];
 
 export default defineConfig({
   testDir: './e2e',