Add environment configuration and local development documentation

- Parameterize CORS_ORIGINS in docker-compose.swarm.yml
- Add .env.example with configuration options
- Create comprehensive LOCAL_DEVELOPMENT.md guide
- Update README.md with environment variable documentation
- Provide alternatives for local development without production domain

🤖 Generated with [Claude Code](https://claude.ai/code)

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

backend/app/cli_agents/cli_agent_manager.py

@@ -11,7 +11,7 @@ from typing import Dict, Any, Optional
 from dataclasses import asdict
 
 # Add CCLI source to path
-ccli_path = os.path.join(os.path.dirname(__file__), '../../../../ccli/src')
+ccli_path = os.path.join(os.path.dirname(__file__), '../../../ccli_src')
 sys.path.insert(0, ccli_path)
 
 from agents.gemini_cli_agent import GeminiCliAgent, GeminiCliConfig, TaskRequest as CliTaskRequest, TaskResult as CliTaskResult