Adds a compatibility layer that detects and supports legacy extensions using the monkey-patching pattern, while warning developers about the deprecated approach.
**Features:**
- Automatic detection of monkey-patched context menu methods
- Console warnings with extension name for deprecated patterns
- Extraction and integration of legacy menu items
- Extension tracking during setup for accurate warnings
**Files:**
- `src/lib/litegraph/src/contextMenuCompat.ts`: Core compatibility logic
- `src/services/extensionService.ts`: Extension name tracking
- `src/composables/useContextMenuTranslation.ts`: Integration layer
- Comprehensive test coverage
Depends on PR #5977 (context menu extension API)
