fix: guard temperature against NaN when undefined

Move temperature out of the ChatOpenAIFields initializer and apply it
conditionally, matching the pattern used by maxTokens, topP,
frequencyPenalty and presencePenalty. This prevents parseFloat from
returning NaN when the temperature input is undefined or empty.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: FuturMix

packages/components/nodes/chatmodels/ChatFuturMix/ChatFuturMix.ts

@@ -148,13 +148,13 @@ class ChatFuturMix_ChatModels implements INode {
         const futurmixApiKey = getCredentialParam('futurmixApiKey', credentialData, nodeData)
 
         const obj: ChatOpenAIFields = {
-            temperature: parseFloat(temperature),
             modelName,
             openAIApiKey: futurmixApiKey,
             apiKey: futurmixApiKey,
             streaming: streaming ?? true
         }
 
+        if (temperature) obj.temperature = parseFloat(temperature)
         if (maxTokens) obj.maxTokens = parseInt(maxTokens, 10)
         if (topP) obj.topP = parseFloat(topP)
         if (frequencyPenalty) obj.frequencyPenalty = parseFloat(frequencyPenalty)