[refactor] Improve updates/notifications domain organization (#5590)

* [refactor] Move update-related functionality to platform/updates domain

Reorganizes release management, version compatibility, and notification functionality
following Domain-Driven Design principles, mirroring VSCode's architecture pattern.

- Move releaseService.ts to platform/updates/common/
- Move releaseStore.ts to platform/updates/common/
- Move versionCompatibilityStore.ts to platform/updates/common/
- Move useFrontendVersionMismatchWarning.ts to platform/updates/common/
- Move toastStore.ts to platform/updates/common/
- Move ReleaseNotificationToast.vue to platform/updates/components/
- Move WhatsNewPopup.vue to platform/updates/components/
- Update 25+ import paths across codebase and tests

This creates a cohesive "updates" domain containing all functionality related to
software updates, version checking, release notifications, and user communication
about application state changes.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

* fix imports

---------

Co-authored-by: Claude <noreply@anthropic.com>

src/extensions/core/load3d.ts

@@ -8,6 +8,7 @@ import Load3dAnimation from '@/extensions/core/load3d/Load3dAnimation'
 import Load3dUtils from '@/extensions/core/load3d/Load3dUtils'
 import { t } from '@/i18n'
 import type { IStringWidget } from '@/lib/litegraph/src/types/widgets'
+import { useToastStore } from '@/platform/updates/common/toastStore'
 import { CustomInputSpec } from '@/schemas/nodeDef/nodeDefSchemaV2'
 import { api } from '@/scripts/api'
 import { ComfyApp, app } from '@/scripts/app'
@@ -15,7 +16,6 @@ import { ComponentWidgetImpl, addWidget } from '@/scripts/domWidget'
 import { useExtensionService } from '@/services/extensionService'
 import { useLoad3dService } from '@/services/load3dService'
 import { useDialogStore } from '@/stores/dialogStore'
-import { useToastStore } from '@/stores/toastStore'
 import { isLoad3dNode } from '@/utils/litegraphUtil'
 
 async function handleModelUpload(files: FileList, node: any) {