[refactor] Improve workflow domain organization (#5584)

* [refactor] move workflow domain to its own folder

* [refactor] Fix workflow platform architecture organization

- Move workflow rendering functionality to renderer/thumbnail domain
- Rename ui folder to management for better semantic clarity
- Update all import paths to reflect proper domain boundaries
- Fix test imports to use new structure

Architecture improvements:
- rendering → renderer/thumbnail (belongs with other rendering logic)
- ui → management (better name for state management and UI integration)

This ensures proper separation of concerns and domain boundaries.

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

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

* [fix] Resolve circular dependency between nodeDefStore and subgraphStore

* [fix] Update browser test imports to use new workflow platform paths

---------

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

src/renderer/extensions/minimap/composables/useMinimap.ts

@@ -2,9 +2,9 @@ import { useRafFn } from '@vueuse/core'
 import { computed, nextTick, ref, watch } from 'vue'
 
 import type { LGraph } from '@/lib/litegraph/src/litegraph'
+import { useWorkflowStore } from '@/platform/workflow/management/stores/workflowStore'
 import { useCanvasStore } from '@/renderer/core/canvas/canvasStore'
 import { useSettingStore } from '@/stores/settingStore'
-import { useWorkflowStore } from '@/stores/workflowStore'
 
 import type { MinimapCanvas, MinimapSettingsKey } from '../types'
 import { useMinimapGraph } from './useMinimapGraph'

src/renderer/extensions/minimap/composables/useMinimapGraph.ts

@@ -3,7 +3,7 @@ import { ref } from 'vue'
 import type { Ref } from 'vue'
 
 import type { LGraph, LGraphNode } from '@/lib/litegraph/src/litegraph'
-import type { NodeId } from '@/schemas/comfyWorkflowSchema'
+import type { NodeId } from '@/platform/workflow/validation/schemas/workflowSchema'
 import { api } from '@/scripts/api'
 
 import type { UpdateFlags } from '../types'

src/renderer/extensions/vueNodes/composables/useNodeZIndex.ts

@@ -4,9 +4,9 @@
  * Provides focused functionality for managing node layering through z-index.
  * Integrates with the layout system to ensure proper visual ordering.
  */
+import type { NodeId } from '@/platform/workflow/validation/schemas/workflowSchema'
 import { useLayoutMutations } from '@/renderer/core/layout/operations/layoutMutations'
 import { LayoutSource } from '@/renderer/core/layout/types'
-import type { NodeId } from '@/schemas/comfyWorkflowSchema'
 
 interface NodeZIndexOptions {
   /**