[Phase 1.3] Add services orchestration (docker-compose style)

[loonghao]

Parent Issue

Part of #273 - .vx.toml v2 Configuration Enhancement

Objective

Add local development services orchestration similar to docker-compose.

Configuration Format

[services.database]
image = "postgres:16"
ports = ["5432:5432"]
env = { POSTGRES_PASSWORD = "dev", POSTGRES_DB = "app" }
volumes = ["./data/postgres:/var/lib/postgresql/data"]
healthcheck = "pg_isready -U postgres"

[services.redis]
image = "redis:7-alpine"
ports = ["6379:6379"]

[services.app]
command = "npm run dev"
depends_on = ["database", "redis"]
ports = ["3000:3000"]
env_file = ".env.local"
working_dir = "./src"

Tasks

• Define ServiceConfig structure
• Implement vx services start [name] command
• Implement vx services stop [name] command
• Implement vx services status command
• Implement vx services logs [name] command
• Add dependency resolution (depends_on)
• Add health check support
• Support both Docker and Podman
• Generate docker-compose.yml from config
• Add unit tests

Commands

vx services start          # Start all services
vx services start database # Start specific service
vx services stop           # Stop all services
vx services status         # Show service status
vx services logs redis     # Show service logs
vx services export         # Generate docker-compose.yml

Acceptance Criteria

• Services start in dependency order
• Health checks work correctly
• Logs are accessible
• Works with both Docker and Podman
• vx services export generates valid docker-compose.yml