[backport 1.28] add pricing for new Veo3.1 model (#6075)

Backport of #6074 to `core/1.28`

Automatically created by backport workflow.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6075-backport-1-28-add-pricing-for-new-Veo3-1-model-28d6d73d365081c0b647f8a472d4fca9)
by [Unito](https://www.unito.io)

Co-authored-by: Alexander Piskun <13381981+bigcat88@users.noreply.github.com>

Author: comfy-pr-bot

src/composables/node/useNodePricing.ts

@@ -1141,9 +1141,15 @@ const apiNodeCosts: Record<string, { displayPrice: string | PricingFunction }> =
         const generateAudio =
           String(generateAudioWidget.value).toLowerCase() === 'true'
 
-        if (model.includes('veo-3.0-fast-generate-001')) {
+        if (
+          model.includes('veo-3.0-fast-generate-001') ||
+          model.includes('veo-3.1-fast-generate')
+        ) {
           return generateAudio ? '$1.20/Run' : '$0.80/Run'
-        } else if (model.includes('veo-3.0-generate-001')) {
+        } else if (
+          model.includes('veo-3.0-generate-001') ||
+          model.includes('veo-3.1-generate')
+        ) {
           return generateAudio ? '$3.20/Run' : '$1.60/Run'
         }