refactor: start on removing FF for subscription tiers (#7596)

## Summary

Refactor: remove FF for subscription tier, remove legacy code for non
subscription tier logic.
 
## Review Focus

Preexisting cloud functionality impact.

<!-- If this PR fixes an issue, uncomment and update the line below -->
<!-- Fixes #ISSUE_NUMBER -->

## Screenshots (if applicable)

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┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7596-refactor-start-on-removing-FF-for-subscription-tiers-2cc6d73d3650816bac3aef893e4f37cd)
by [Unito](https://www.unito.io)

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

@@ -40,17 +40,7 @@
         </div>
 
         <div v-if="isSubgraphNode" class="icon-[comfy--workflow] size-4" />
-        <div
-          v-if="isApiNode"
-          :class="
-            cn(
-              'size-4',
-              flags.subscriptionTiersEnabled
-                ? 'icon-[lucide--component]'
-                : 'icon-[lucide--dollar-sign]'
-            )
-          "
-        />
+        <div v-if="isApiNode" class="icon-[lucide--component] size-4" />
 
         <!-- Node Title -->
         <div
@@ -107,7 +97,6 @@ import EditableText from '@/components/common/EditableText.vue'
 import Button from '@/components/ui/button/Button.vue'
 import type { VueNodeData } from '@/composables/graph/useGraphNodeManager'
 import { useErrorHandling } from '@/composables/useErrorHandling'
-import { useFeatureFlags } from '@/composables/useFeatureFlags'
 import { st } from '@/i18n'
 import { LGraphEventMode, RenderShape } from '@/lib/litegraph/src/litegraph'
 import { useSettingStore } from '@/platform/settings/settingStore'
@@ -138,8 +127,6 @@ const emit = defineEmits<{
   'enter-subgraph': []
 }>()
 
-const { flags } = useFeatureFlags()
-
 // Error boundary implementation
 const renderError = ref<string | null>(null)
 const { toastErrorHandler } = useErrorHandling()