[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/components/dialog/content/manager/button/PackUninstallButton.vue

@@ -1,53 +0,0 @@
-<template>
-  <IconTextButton
-    v-bind="$attrs"
-    type="transparent"
-    :label="
-      nodePacks.length > 1
-        ? $t('manager.uninstallSelected')
-        : $t('manager.uninstall')
-    "
-    :border="true"
-    :size="size"
-    class="border-red-500"
-    @click="uninstallItems"
-  />
-</template>
-
-<script setup lang="ts">
-import IconTextButton from '@/components/button/IconTextButton.vue'
-import { useComfyManagerStore } from '@/stores/comfyManagerStore'
-import type { ButtonSize } from '@/types/buttonTypes'
-import type { components } from '@/types/comfyRegistryTypes'
-import type { components as ManagerComponents } from '@/types/generatedManagerTypes'
-
-type NodePack = components['schemas']['Node']
-
-const { nodePacks, size } = defineProps<{
-  nodePacks: NodePack[]
-  size?: ButtonSize
-}>()
-
-const managerStore = useComfyManagerStore()
-
-const createPayload = (
-  uninstallItem: NodePack
-): ManagerComponents['schemas']['ManagerPackInfo'] => {
-  if (!uninstallItem.id) {
-    throw new Error('Node ID is required for uninstallation')
-  }
-
-  return {
-    id: uninstallItem.id,
-    version: uninstallItem.latest_version?.version || 'unknown'
-  }
-}
-
-const uninstallPack = (item: NodePack) =>
-  managerStore.uninstallPack(createPayload(item))
-
-const uninstallItems = async () => {
-  if (!nodePacks?.length) return
-  await Promise.all(nodePacks.map(uninstallPack))
-}
-</script>