feat: Add HTTP proxy for supported LLM nodes (#15449)

packages/@n8n/nodes-langchain/nodes/llms/LmChatOpenRouter/LmChatOpenRouter.node.ts

@@ -9,6 +9,7 @@ import {
 	type SupplyData,
 } from 'n8n-workflow';
 
+import { getHttpProxyAgent } from '@utils/httpProxyAgent';
 import { getConnectionHintNoticeField } from '@utils/sharedFields';
 
 import { openAiFailedAttemptHandler } from '../../vendors/OpenAi/helpers/error-handling';
@@ -227,6 +228,7 @@ export class LmChatOpenRouter implements INodeType {
 
 		const configuration: ClientOptions = {
 			baseURL: credentials.url,
+			httpAgent: getHttpProxyAgent(),
 		};
 
 		const model = new ChatOpenAI({