fix: resolve homepage host validation issue using TDD approach

- Created test to verify homepage host validation issue
- Identified that HOMEPAGE_ALLOWED_HOSTS environment variable was needed
- Updated homepage Docker Compose with proper allowed hosts setting
- Added 'localhost:4000,127.0.0.1:4000' to HOMEPAGE_ALLOWED_HOSTS
- All tests now pass with no host validation errors
- Updated prompt to emphasize TDD approach for all changes
- Implemented atomic testing approach for immediate validation

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

artifacts/SupportStack/docker-compose/TSYSDevStack-SupportStack-Demo-DockerCompose-homepage.yml

@@ -11,6 +11,7 @@ services:
       - PORT=3000
       - HOMEPAGE_URL=http://localhost:4000
       - BASE_URL=http://localhost:4000
+      - HOMEPAGE_ALLOWED_HOSTS=localhost:4000,127.0.0.1:4000
     volumes:
       - ./config/homepage:/app/config
       - /var/run/docker.sock:/var/run/docker.sock:ro  # For Docker integration