[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)

tests-ui/tests/components/dialog/content/manager/NodeConflictDialogContent.test.ts

@@ -4,8 +4,8 @@ import Button from 'primevue/button'
 import { beforeEach, describe, expect, it, vi } from 'vitest'
 import { computed, ref } from 'vue'
 
-import NodeConflictDialogContent from '@/components/dialog/content/manager/NodeConflictDialogContent.vue'
 import type { ConflictDetectionResult } from '@/types/conflictDetectionTypes'
+import NodeConflictDialogContent from '@/workbench/extensions/manager/components/manager/NodeConflictDialogContent.vue'
 
 // Mock getConflictMessage utility
 vi.mock('@/utils/conflictMessageUtil', () => ({

tests-ui/tests/components/dialog/content/manager/packCard/PackCard.test.ts

@@ -4,8 +4,11 @@ import Card from 'primevue/card'
 import ProgressSpinner from 'primevue/progressspinner'
 import { beforeEach, describe, expect, it, vi } from 'vitest'
 
-import PackCard from '@/components/dialog/content/manager/packCard/PackCard.vue'
-import type { MergedNodePack, RegistryPack } from '@/types/comfyManagerTypes'
+import PackCard from '@/workbench/extensions/manager/components/manager/packCard/PackCard.vue'
+import type {
+  MergedNodePack,
+  RegistryPack
+} from '@/workbench/extensions/manager/types/comfyManagerTypes'
 
 // Mock dependencies
 vi.mock('vue-i18n', () => ({
@@ -21,7 +24,7 @@ vi.mock('vue-i18n', () => ({
   }))
 }))
 
-vi.mock('@/stores/comfyManagerStore', () => ({
+vi.mock('@/workbench/extensions/manager/stores/comfyManagerStore', () => ({
   useComfyManagerStore: vi.fn(() => ({
     isPackInstalled: vi.fn(() => false),
     isPackEnabled: vi.fn(() => true),