chore: Update environment configuration and package dependencies for MCP server

- Change MCP_SERVER in .env.example to use port 7123
- Add USE_STDIO_TRANSPORT flag in .env.example for stdio transport mode
- Update bun.lock to include new dependencies: cors, express, ajv, and their type definitions
- Add new scripts for building and running the MCP server with stdio transport
- Introduce PUBLISHING.md for npm publishing guidelines
- Enhance README with detailed setup instructions and tool descriptions

.env.example

@@ -3,7 +3,8 @@ NODE_ENV=development
 PORT=7123
 DEBUG=false
 LOG_LEVEL=info
-MCP_SERVER=http://localhost:3000
+MCP_SERVER=http://localhost:7123
+USE_STDIO_TRANSPORT=true
 
 # Home Assistant Configuration
 HASS_HOST=http://homeassistant.local:8123