Add npm scripts for starting all services

[Copilot]

The problem statement "Start all" requested a convenient way to start all ZeaZDev services.

Changes

Root package.json - Added npm scripts wrapping the existing start-all-phases.sh:

• npm start - Start all services (backend + frontend)
• npm run check - Validate configuration
• npm run install:all - Install dependencies
• npm run status - Check service status
• npm run stop - Stop all services
• Component-specific variants: start:backend, start:frontend

Documentation - Updated README.md and QUICK_START.md to show npm scripts as the primary method, with bash scripts as alternative.

Usage

npm run check        # Validate .env files exist
npm run install:all  # Install all dependencies
npm start            # Start everything

The existing start-all-phases.sh script remains unchanged and fully functional.

Original prompt

Start all

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