Add full Proxy Hosts feature for Control Room:
- Data layer: datasource, model with custom JSON converters for NPM API quirks
- Domain layer: ProxyHost entity with SSL, caching, websocket support
- Presentation: list page, detail/edit page, form widget
Add reusable entity page patterns for Control Room sections:
- EntityPageScaffold, EntitySection, EntitySettingRow components
- EntityForm with create/view/edit mode support
- EntityPageModeMixin for consistent mode management
- CreateOnlyField for immutable-after-creation fields
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
