refactor(timeout): reuse shared api request timeout

ts/api/handlers/chat.ts

@@ -6,6 +6,7 @@ import * as http from 'node:http';
 import type { IApiError, IChatCompletionRequest } from '../../interfaces/api.ts';
 import { ClusterCoordinator } from '../../cluster/coordinator.ts';
 import { ContainerManager } from '../../containers/container-manager.ts';
+import { API_SERVER } from '../../constants.ts';
 import { logger } from '../../logger.ts';
 import { ModelRegistry } from '../../models/registry.ts';
 import { ModelLoader } from '../../models/loader.ts';
@@ -158,11 +159,14 @@ export class ChatHandler {
     targetEndpoint: string,
     body: IChatCompletionRequest,
   ): Promise<void> {
+    const controller = new AbortController();
+    const timeout = setTimeout(() => controller.abort(), API_SERVER.REQUEST_TIMEOUT_MS);
     const response = await fetch(`${targetEndpoint}/v1/chat/completions`, {
       method: 'POST',
       headers: this.buildForwardHeaders(req),
       body: JSON.stringify(body),
-    });
+      signal: controller.signal,
+    }).finally(() => clearTimeout(timeout));
 
     if (body.stream) {
       res.writeHead(response.status, {