refactor: rename useSlotContextMenu to slotMenuService

Not a composable — returns no reactive state and has no lifecycle
integration.

Addresses review feedback:
https://github.com/Comfy-Org/ComfyUI_frontend/pull/9045#discussion_r2925519398

src/renderer/extensions/vueNodes/components/InputSlot.vue

@@ -67,7 +67,7 @@ import { useNodeTooltips } from '@/renderer/extensions/vueNodes/composables/useN
 import {
   hasAnySlotAction,
   showSlotMenu
-} from '@/renderer/extensions/vueNodes/composables/useSlotContextMenu'
+} from '@/renderer/extensions/vueNodes/composables/slotMenuService'
 import { useSlotElementTracking } from '@/renderer/extensions/vueNodes/composables/useSlotElementTracking'
 import { useSlotLinkInteraction } from '@/renderer/extensions/vueNodes/composables/useSlotLinkInteraction'
 import { cn } from '@comfyorg/tailwind-utils'

src/renderer/extensions/vueNodes/components/OutputSlot.vue

@@ -39,7 +39,7 @@ import { useNodeTooltips } from '@/renderer/extensions/vueNodes/composables/useN
 import {
   hasAnySlotAction,
   showSlotMenu
-} from '@/renderer/extensions/vueNodes/composables/useSlotContextMenu'
+} from '@/renderer/extensions/vueNodes/composables/slotMenuService'
 import { useSlotElementTracking } from '@/renderer/extensions/vueNodes/composables/useSlotElementTracking'
 import { useSlotLinkInteraction } from '@/renderer/extensions/vueNodes/composables/useSlotLinkInteraction'
 import { cn } from '@comfyorg/tailwind-utils'

src/renderer/extensions/vueNodes/components/SlotContextMenu.vue

@@ -53,8 +53,8 @@ import {
   registerSlotMenuInstance,
   removeSlot,
   renameSlot
-} from '@/renderer/extensions/vueNodes/composables/useSlotContextMenu'
-import type { SlotMenuContext } from '@/renderer/extensions/vueNodes/composables/useSlotContextMenu'
+} from '@/renderer/extensions/vueNodes/composables/slotMenuService'
+import type { SlotMenuContext } from '@/renderer/extensions/vueNodes/composables/slotMenuService'
 import { useDialogService } from '@/services/dialogService'
 
 const { t } = useI18n()

src/renderer/extensions/vueNodes/composables/slotMenuService.test.ts

@@ -26,7 +26,7 @@ import {
   hasAnySlotAction,
   removeSlot,
   renameSlot
-} from './useSlotContextMenu'
+} from './slotMenuService'
 
 describe(canRenameSlot, () => {
   beforeEach(() => {