[refactor] Migrate manager code to DDD structure (#5662)

## Summary

Reorganized custom nodes manager functionality from scattered technical
layers into a cohesive domain-focused module following [domain-driven
design](https://en.wikipedia.org/wiki/Domain-driven_design) principles.

## Changes

- **What**: Migrated all manager code from technical layers
(`src/components/`, `src/stores/`, etc.) to unified domain structure at
`src/workbench/extensions/manager/`
- **Breaking**: Import paths changed for all manager-related modules
(40+ files updated)

## Review Focus

Verify all import path updates are correct and no circular dependencies
introduced. Check that [Vue 3 composition
API](https://vuejs.org/guide/reusability/composables.html) patterns
remain consistent across relocated composables.


┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-5662-refactor-Migrate-manager-code-to-DDD-structure-2736d73d3650812c87faf6ed0fffb196)
by [Unito](https://www.unito.io)

src/components/helpcenter/HelpCenterMenuContent.vue

@@ -142,14 +142,14 @@ import { useI18n } from 'vue-i18n'
 
 import PuzzleIcon from '@/components/icons/PuzzleIcon.vue'
 import { useConflictAcknowledgment } from '@/composables/useConflictAcknowledgment'
-import { useManagerState } from '@/composables/useManagerState'
 import { useSettingStore } from '@/platform/settings/settingStore'
 import type { ReleaseNote } from '@/platform/updates/common/releaseService'
 import { useReleaseStore } from '@/platform/updates/common/releaseStore'
 import { useCommandStore } from '@/stores/commandStore'
-import { ManagerTab } from '@/types/comfyManagerTypes'
 import { electronAPI, isElectron } from '@/utils/envUtil'
 import { formatVersionAnchor } from '@/utils/formatUtil'
+import { useManagerState } from '@/workbench/extensions/manager/composables/useManagerState'
+import { ManagerTab } from '@/workbench/extensions/manager/types/comfyManagerTypes'
 
 // Types
 interface MenuItem {