[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/components/graph/GraphCanvas.vue

@@ -107,11 +107,13 @@ import { useGlobalLitegraph } from '@/composables/useGlobalLitegraph'
 import { useLitegraphSettings } from '@/composables/useLitegraphSettings'
 import { usePaste } from '@/composables/usePaste'
 import { useVueFeatureFlags } from '@/composables/useVueFeatureFlags'
-import { useWorkflowAutoSave } from '@/composables/useWorkflowAutoSave'
-import { useWorkflowPersistence } from '@/composables/useWorkflowPersistence'
 import { CORE_SETTINGS } from '@/constants/coreSettings'
 import { i18n, t } from '@/i18n'
 import type { LGraphNode } from '@/lib/litegraph/src/litegraph'
+import { useWorkflowService } from '@/platform/workflow/core/services/workflowService'
+import { useWorkflowStore } from '@/platform/workflow/management/stores/workflowStore'
+import { useWorkflowAutoSave } from '@/platform/workflow/persistence/composables/useWorkflowAutoSave'
+import { useWorkflowPersistence } from '@/platform/workflow/persistence/composables/useWorkflowPersistence'
 import { useCanvasStore } from '@/renderer/core/canvas/canvasStore'
 import { SelectedNodeIdsKey } from '@/renderer/core/canvas/injectionKeys'
 import TransformPane from '@/renderer/core/layout/transform/TransformPane.vue'
@@ -125,13 +127,11 @@ import { ChangeTracker } from '@/scripts/changeTracker'
 import { IS_CONTROL_WIDGET, updateControlWidgetLabel } from '@/scripts/widgets'
 import { useColorPaletteService } from '@/services/colorPaletteService'
 import { newUserService } from '@/services/newUserService'
-import { useWorkflowService } from '@/services/workflowService'
 import { useCommandStore } from '@/stores/commandStore'
 import { useExecutionStore } from '@/stores/executionStore'
 import { useNodeDefStore } from '@/stores/nodeDefStore'
 import { useSettingStore } from '@/stores/settingStore'
 import { useToastStore } from '@/stores/toastStore'
-import { useWorkflowStore } from '@/stores/workflowStore'
 import { useColorPaletteStore } from '@/stores/workspace/colorPaletteStore'
 import { useSearchBoxStore } from '@/stores/workspace/searchBoxStore'
 import { useWorkspaceStore } from '@/stores/workspaceStore'

src/components/graph/selectionToolbox/ColorPickerButton.spec.ts

@@ -7,8 +7,8 @@ import { createI18n } from 'vue-i18n'
 
 // Import after mocks
 import ColorPickerButton from '@/components/graph/selectionToolbox/ColorPickerButton.vue'
+import { useWorkflowStore } from '@/platform/workflow/management/stores/workflowStore'
 import { useCanvasStore } from '@/renderer/core/canvas/canvasStore'
-import { useWorkflowStore } from '@/stores/workflowStore'
 
 // Mock the litegraph module
 vi.mock('@/lib/litegraph/src/litegraph', async () => {

src/components/graph/selectionToolbox/ColorPickerButton.vue

@@ -62,8 +62,8 @@ import {
   LiteGraph,
   isColorable
 } from '@/lib/litegraph/src/litegraph'
+import { useWorkflowStore } from '@/platform/workflow/management/stores/workflowStore'
 import { useCanvasStore } from '@/renderer/core/canvas/canvasStore'
-import { useWorkflowStore } from '@/stores/workflowStore'
 import { useColorPaletteStore } from '@/stores/workspace/colorPaletteStore'
 import { adjustColor } from '@/utils/colorUtil'
 import { getItemsColorOption } from '@/utils/litegraphUtil'