[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/composables/useConflictDetection.test.ts

@@ -4,7 +4,7 @@ import { nextTick } from 'vue'
 
 import { useConflictDetection } from '@/composables/useConflictDetection'
 import type { components } from '@/types/comfyRegistryTypes'
-import type { components as ManagerComponents } from '@/types/generatedManagerTypes'
+import type { components as ManagerComponents } from '@/workbench/extensions/manager/types/generatedManagerTypes'
 
 type InstalledPacksResponse =
   ManagerComponents['schemas']['InstalledPacksResponse']
@@ -27,7 +27,7 @@ vi.mock('@/scripts/api', () => ({
   }
 }))
 
-vi.mock('@/services/comfyManagerService', () => ({
+vi.mock('@/workbench/extensions/manager/services/comfyManagerService', () => ({
   useComfyManagerService: vi.fn()
 }))
 
@@ -57,7 +57,7 @@ vi.mock('@/composables/nodePack/useInstalledPacks', () => ({
   }))
 }))
 
-vi.mock('@/stores/comfyManagerStore', () => ({
+vi.mock('@/workbench/extensions/manager/stores/comfyManagerStore', () => ({
   useComfyManagerStore: vi.fn(() => ({
     isPackInstalled: vi.fn(),
     installedPacks: { value: [] }
@@ -140,7 +140,7 @@ describe.skip('useConflictDetection with Registry Store', () => {
 
     // Mock useComfyManagerService
     const { useComfyManagerService } = await import(
-      '@/services/comfyManagerService'
+      '@/workbench/extensions/manager/services/comfyManagerService'
     )
     vi.mocked(useComfyManagerService).mockReturnValue(
       mockComfyManagerService as any