[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/scripts/changeTracker.ts

@@ -3,11 +3,14 @@ import * as jsondiffpatch from 'jsondiffpatch'
 import log from 'loglevel'
 
 import { LGraphCanvas, LiteGraph } from '@/lib/litegraph/src/litegraph'
+import {
+  ComfyWorkflow,
+  useWorkflowStore
+} from '@/platform/workflow/management/stores/workflowStore'
+import type { ComfyWorkflowJSON } from '@/platform/workflow/validation/schemas/workflowSchema'
 import type { ExecutedWsMessage } from '@/schemas/apiSchema'
-import type { ComfyWorkflowJSON } from '@/schemas/comfyWorkflowSchema'
 import { useExecutionStore } from '@/stores/executionStore'
 import { useSubgraphNavigationStore } from '@/stores/subgraphNavigationStore'
-import { ComfyWorkflow, useWorkflowStore } from '@/stores/workflowStore'
 
 import { api } from './api'
 import type { ComfyApp } from './app'