Add development environment for mcp-worker

[jonathannorris]

Sets up a separate development environment for testing mcp-worker changes before production deployment.

Key Changes

• Development worker: devcycle-mcp-server-dev with mcp-dev.devcycle.com route
• Isolated resources: Separate durable objects and KV namespace for dev environment
• Environment variables: Development-specific configuration (NODE_ENV=development)
• Deploy script: Added yarn deploy:dev for easy development deployment

Benefits

✅ Safe testing environment isolated from production
✅ Separate deployment pipeline for development changes
✅ Same configuration structure as production for consistency

Usage

# Deploy to development
yarn deploy:dev

# Test at
https://mcp-dev.devcycle.com

This enables safer development and testing workflows without affecting the production MCP server.

[JamieSinn]

Did you add a dev auth0 client?

[jonathannorris]

@JamieSinn yea different keys and application for this.