fix: use undici's own fetch for proxy dispatcher support

Node's global fetch doesn't support the dispatcher option. Use
undici's exported fetch when proxy is configured, which properly
handles ProxyAgent as a dispatcher.

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

apps/api/src/integrations/emex/emex.service.ts

@@ -18,7 +18,7 @@ import {
 } from '@nestjs/common';
 import { ConfigService } from '@nestjs/config';
 import * as path from 'path';
-import { ProxyAgent } from 'undici';
+import { ProxyAgent, fetch as undiciFetch } from 'undici';
 
 import {
   EmexScraperResponse,
@@ -242,15 +242,19 @@ export class EmexService {
    * without requiring authentication cookies.
    */
   private async fetchEmexHtml(url: string): Promise<string> {
-    // eslint-disable-next-line @typescript-eslint/no-explicit-any
-    const options: any = {
-      headers: { 'User-Agent': EMEX_UA, 'Accept': 'text/html,application/xhtml+xml' },
-      signal: AbortSignal.timeout(this.timeout),
-    };
+    const headers = { 'User-Agent': EMEX_UA, 'Accept': 'text/html,application/xhtml+xml' };
+    const signal = AbortSignal.timeout(this.timeout);
+    let res: Response;
     if (this.proxyUrl) {
-      options.dispatcher = new ProxyAgent(this.proxyUrl);
+      // Use undici's fetch which supports the dispatcher option for proxy
+      res = await undiciFetch(url, {
+        headers,
+        signal,
+        dispatcher: new ProxyAgent(this.proxyUrl),
+      }) as unknown as Response;
+    } else {
+      res = await fetch(url, { headers, signal });
     }
-    const res = await fetch(url, options);
     if (!res.ok) {
       throw new Error(`EMEX HTTP ${res.status} for ${url}`);
     }