feat: Add REST API server mode

[appcypher]

Overview

This PR adds a new server mode to monocore that exposes a REST API for managing services. The server provides endpoints for starting, stopping, checking status, and removing services.

Key changes

• Added new serve subcommand to start monocore in server mode
• Implemented REST API endpoints:
  • POST /up - Start services defined in config
  • POST /down - Stop running services
  • GET /status - Get status of all services
  • POST /remove - Remove service files
• Added server-related modules:
  • handlers.rs - Request handlers for each endpoint
  • routes.rs - API route definitions
  • state.rs - Server state management
  • types.rs - Request/response type definitions
• Updated README with API documentation and examples
• Added default server port (3000) configuration

The REST API allows monocore to be integrated with other tools and services while maintaining the same functionality as the CLI. All operations available through the CLI can now be performed via HTTP requests.

Example usage

# Start services from config file
curl -X POST http://localhost:3000/up \
-H "Content-Type: application/json" \
-d @monocore.toml

# Start services in specific group
curl -X POST http://localhost:3000/up \
-H "Content-Type: application/json" \
-d '{"config": {...}, "group": "backend"}'

# Get status of all services
curl http://localhost:3000/status

# Stop all services in a group
curl -X POST http://localhost:3000/down \
-H "Content-Type: application/json" \
-d '{"group": "frontend"}'

# Stop all services
curl -X POST http://localhost:3000/down \
-H "Content-Type: application/json" \
-d '{}'

# Remove specific services
curl -X POST http://localhost:3000/remove \
-H "Content-Type: application/json" \
-d '{"services": ["web", "api"]}'

# Remove all services in a group
curl -X POST http://localhost:3000/remove \
-H "Content-Type: application/json" \
-d '{"group": "backend"}'