software/erp5-mcp-hateoas: add MCP server software release with OAuth support

Summary

• Add SlapOS software release for erp5-mcp-hateoas (MCP server for ERP5)
• HAProxy TLS frontend, OAuth support, JSON Schema parameter validation
• Monitor stack integration, promises, logrotate
• Deployment tests via slapos-sr-testing
• Claude Code skills for instance management (deploy, show, export scripts)

Test plan

• Software release builds successfully
• Instance deploys and publishes connection parameters
• MCP server responds on published URL
• Deployment tests pass