[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)

src/workbench/extensions/manager/components/ManagerProgressHeader.vue

@@ -0,0 +1,44 @@
+<template>
+  <div
+    v-if="progressDialogContent.isExpanded"
+    class="px-4 py-2 flex items-center"
+  >
+    <TabMenu
+      v-model:active-index="activeTabIndex"
+      :model="tabs"
+      class="w-full border-none"
+      :pt="{
+        menu: { class: 'border-none' },
+        menuitem: { class: 'font-medium' },
+        action: { class: 'px-4 py-2' }
+      }"
+    />
+  </div>
+</template>
+
+<script setup lang="ts">
+import TabMenu from 'primevue/tabmenu'
+import { computed } from 'vue'
+import { useI18n } from 'vue-i18n'
+
+import {
+  useComfyManagerStore,
+  useManagerProgressDialogStore
+} from '@/workbench/extensions/manager/stores/comfyManagerStore'
+
+const progressDialogContent = useManagerProgressDialogStore()
+const comfyManagerStore = useComfyManagerStore()
+const activeTabIndex = computed({
+  get: () => progressDialogContent.getActiveTabIndex(),
+  set: (value) => progressDialogContent.setActiveTabIndex(value)
+})
+const { t } = useI18n()
+const tabs = computed(() => [
+  { label: t('manager.installationQueue') },
+  {
+    label: t('manager.failed', {
+      count: comfyManagerStore.failedTasksIds.length
+    })
+  }
+])
+</script>