🔧 chore(database): remove hardcoded password from test database URL

- remove hardcoded "test_password" from default test database connection string
- enhance security by using default PostgreSQL authentication for local testing environment

src/server/data-source.ts

@@ -14,7 +14,7 @@ import { Passenger } from "./modules/passengers/passenger.entity"
 
 // 在测试环境下使用测试数据库配置
 const isTestEnv = process.env.NODE_ENV === 'test';
-const testDatabaseUrl = process.env.TEST_DATABASE_URL || 'postgresql://postgres:test_password@localhost:5432/test_d8dai';
+const testDatabaseUrl = process.env.TEST_DATABASE_URL || 'postgresql://postgres@localhost:5432/test_d8dai';
 ;
 
 const dataSource = isTestEnv && testDatabaseUrl