[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

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

src/stores/queueStore.ts

@@ -2,6 +2,10 @@ import _ from 'es-toolkit/compat'
 import { defineStore } from 'pinia'
 import { computed, ref, toRaw } from 'vue'
 
+import type {
+  ComfyWorkflowJSON,
+  NodeId
+} from '@/platform/workflow/validation/schemas/workflowSchema'
 import type {
   ResultItem,
   StatusWsMessageStatus,
@@ -11,7 +15,6 @@ import type {
   TaskStatus,
   TaskType
 } from '@/schemas/apiSchema'
-import type { ComfyWorkflowJSON, NodeId } from '@/schemas/comfyWorkflowSchema'
 import { api } from '@/scripts/api'
 import type { ComfyApp } from '@/scripts/app'
 import { useExtensionService } from '@/services/extensionService'