feat: enhance production deployment configuration and documentation

- Update .env.example with production-ready environment variables
- Add frontend Aliyun deployment configuration with nginx gateway
- Refactor docker-compose.server.yml for external services
- Add comprehensive deployment guide (docs/DEPLOYMENT.md)
- Enhance troubleshooting documentation with Git Bash path issues
- Add deployment scripts (build-frontend.sh, deploy-frontend.sh)
- Add deploy directory with docker-compose and nginx config
- Update .gitignore to exclude temporary directories

Co-Authored-By: Claude <noreply@anthropic.com>

.gitignore

@@ -20,3 +20,6 @@ project-docs/automation-artifacts/
 backend/project-docs/qa-artifacts/
 .claude/worktrees/
 .gstack/
+
+# Temporary directories
+temp-*/