[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/store/comfyManagerStore.test.ts

@@ -2,9 +2,9 @@ import { createPinia, setActivePinia } from 'pinia'
 import { beforeEach, describe, expect, it, vi } from 'vitest'
 import { nextTick, ref } from 'vue'
 
-import { useComfyManagerService } from '@/services/comfyManagerService'
-import { useComfyManagerStore } from '@/stores/comfyManagerStore'
-import type { components as ManagerComponents } from '@/types/generatedManagerTypes'
+import { useComfyManagerService } from '@/workbench/extensions/manager/services/comfyManagerService'
+import { useComfyManagerStore } from '@/workbench/extensions/manager/stores/comfyManagerStore'
+import type { components as ManagerComponents } from '@/workbench/extensions/manager/types/generatedManagerTypes'
 
 type InstalledPacksResponse =
   ManagerComponents['schemas']['InstalledPacksResponse']
@@ -13,7 +13,7 @@ type ManagerDatabaseSource =
   ManagerComponents['schemas']['ManagerDatabaseSource']
 type ManagerPackInstalled = ManagerComponents['schemas']['ManagerPackInstalled']
 
-vi.mock('@/services/comfyManagerService', () => ({
+vi.mock('@/workbench/extensions/manager/services/comfyManagerService', () => ({
   useComfyManagerService: vi.fn()
 }))
 
@@ -23,7 +23,7 @@ vi.mock('@/services/dialogService', () => ({
   })
 }))
 
-vi.mock('@/composables/useManagerQueue', () => {
+vi.mock('@/workbench/extensions/manager/composables/useManagerQueue', () => {
   const enqueueTaskMock = vi.fn()
 
   return {