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>

.env.example

@@ -0,0 +1,23 @@
+# Hive Environment Configuration
+# Copy this file to .env and customize for your environment
+
+# CORS Configuration
+# For development: CORS_ORIGINS=http://localhost:3000,http://localhost:3001
+# For production: CORS_ORIGINS=https://hive.home.deepblack.cloud
+CORS_ORIGINS=https://hive.home.deepblack.cloud
+
+# Database Configuration
+DATABASE_URL=postgresql://hive:hivepass@postgres:5432/hive
+
+# Redis Configuration
+REDIS_URL=redis://redis:6379
+
+# Environment
+ENVIRONMENT=production
+
+# Logging
+LOG_LEVEL=info
+
+# Traefik Configuration (for local development)
+# Set this if you want to use a different domain for local development
+# TRAEFIK_HOST=hive.local.dev