feat: support dev-only nodes (#8359)

## Summary

Support `dev_only` property to node definitions that hides nodes from
search and menus unless dev mode is enabled. Dev-only nodes display a
"DEV" badge when visible.

This functionality is primarily intended to support unit-testing nodes
on Comfy Cloud, but also has other uses.

## Changes

- **What**: Nodes flagged as dev_only in the node schema will only
appear in search and menus if Dev Mode is on.

## Screenshots (if applicable)

With Dev Mode off:
<img width="2189" height="1003" alt="image"
src="https://github.com/user-attachments/assets/a08e1fd7-dca9-4ce1-9964-5f4f3b7b95ac"
/>

With Dev Mode on:
<img width="2201" height="1066" alt="image"
src="https://github.com/user-attachments/assets/7fe6cd1f-f774-4f48-b604-a528e286b584"
/>

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8359-feat-support-dev-only-nodes-2f66d73d36508102839ee7cd66a26129)
by [Unito](https://www.unito.io)

src/stores/nodeDefStore.ts

@@ -1,9 +1,10 @@
 import axios from 'axios'
 import _ from 'es-toolkit/compat'
 import { defineStore } from 'pinia'
-import { computed, ref } from 'vue'
+import { computed, ref, watchEffect } from 'vue'
 
 import { isProxyWidget } from '@/core/graph/subgraph/proxyWidget'
+import { LiteGraph } from '@/lib/litegraph/src/litegraph'
 import type { LGraphNode } from '@/lib/litegraph/src/litegraph'
 import { transformNodeDefV1ToV2 } from '@/schemas/nodeDef/migration'
 import type {
@@ -17,6 +18,7 @@ import type {
   ComfyOutputTypesSpec as ComfyOutputSpecV1,
   PriceBadge
 } from '@/schemas/nodeDefSchema'
+import { useSettingStore } from '@/platform/settings/settingStore'
 import { NodeSearchService } from '@/services/nodeSearchService'
 import { useSubgraphStore } from '@/stores/subgraphStore'
 import { NodeSourceType, getNodeSource } from '@/types/nodeSource'
@@ -41,6 +43,7 @@ export class ComfyNodeDefImpl
   readonly help: string
   readonly deprecated: boolean
   readonly experimental: boolean
+  readonly dev_only: boolean
   readonly output_node: boolean
   readonly api_node: boolean
   /**
@@ -133,6 +136,7 @@ export class ComfyNodeDefImpl
     this.deprecated = obj.deprecated ?? obj.category === ''
     this.experimental =
       obj.experimental ?? obj.category.startsWith('_for_testing')
+    this.dev_only = obj.dev_only ?? false
     this.output_node = obj.output_node
     this.api_node = !!obj.api_node
     this.input = obj.input ?? {}
@@ -174,6 +178,7 @@ export class ComfyNodeDefImpl
   get nodeLifeCycleBadgeText(): string {
     if (this.deprecated) return '[DEPR]'
     if (this.experimental) return '[BETA]'
+    if (this.dev_only) return '[DEV]'
     return ''
   }
 }
@@ -299,12 +304,27 @@ export interface NodeDefFilter {
 }
 
 export const useNodeDefStore = defineStore('nodeDef', () => {
+  const settingStore = useSettingStore()
+
   const nodeDefsByName = ref<Record<string, ComfyNodeDefImpl>>({})
   const nodeDefsByDisplayName = ref<Record<string, ComfyNodeDefImpl>>({})
   const showDeprecated = ref(false)
   const showExperimental = ref(false)
+  const showDevOnly = computed(() => settingStore.get('Comfy.DevMode'))
   const nodeDefFilters = ref<NodeDefFilter[]>([])
 
+  // Update skip_list on all registered node types when dev mode changes
+  // This ensures LiteGraph's getNodeTypesCategories/getNodeTypesInCategory
+  // correctly filter dev-only nodes from the right-click context menu
+  watchEffect(() => {
+    const devModeEnabled = showDevOnly.value
+    for (const nodeType of Object.values(LiteGraph.registered_node_types)) {
+      if (nodeType.nodeData?.dev_only) {
+        nodeType.skip_list = !devModeEnabled
+      }
+    }
+  })
+
   const nodeDefs = computed(() => {
     const subgraphStore = useSubgraphStore()
     // Blueprints first for discoverability in the node library sidebar
@@ -422,6 +442,14 @@ export const useNodeDefStore = defineStore('nodeDef', () => {
       predicate: (nodeDef) => showExperimental.value || !nodeDef.experimental
     })
 
+    // Dev-only nodes filter
+    registerNodeDefFilter({
+      id: 'core.dev_only',
+      name: 'Hide Dev-Only Nodes',
+      description: 'Hides nodes marked as dev-only unless dev mode is enabled',
+      predicate: (nodeDef) => showDevOnly.value || !nodeDef.dev_only
+    })
+
     // Subgraph nodes filter
     // Filter out litegraph typed subgraphs, saved blueprints are added in separately
     registerNodeDefFilter({
@@ -446,6 +474,7 @@ export const useNodeDefStore = defineStore('nodeDef', () => {
     nodeDefsByDisplayName,
     showDeprecated,
     showExperimental,
+    showDevOnly,
     nodeDefFilters,
 
     nodeDefs,