fix: route EMEX HTTP fetches through DataImpulse proxy

EMEX server blocks direct server IP requests (geo/bot protection),
causing all HTTP-based VIN decodes to return empty results. Add proxy
support to fetchEmexHtml() using undici ProxyAgent, reusing the same
EMEX_USE_PROXY / EMEX_PROXY_* env vars as the browser service.

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

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

@@ -18,6 +18,7 @@ import {
 } from '@nestjs/common';
 import { ConfigService } from '@nestjs/config';
 import * as path from 'path';
+import { ProxyAgent } from 'undici';
 
 import {
   EmexScraperResponse,
@@ -99,6 +100,7 @@ export class EmexService {
   private readonly scraperPath: string;
   private readonly timeout: number;
   private readonly debug: boolean;
+  private readonly proxyUrl: string | null;
 
   constructor(
     private configService: ConfigService,
@@ -117,6 +119,19 @@ export class EmexService {
     this.timeout = this.configService.get<number>('EMEX_TIMEOUT', 60000);
     this.debug = this.configService.get<boolean>('EMEX_DEBUG', false);
 
+    // Proxy config — same env vars as emex.browser.ts
+    const useProxy = this.configService.get<string>('EMEX_USE_PROXY', 'false') === 'true';
+    if (useProxy) {
+      const host = this.configService.get<string>('EMEX_PROXY_HOST', '74.81.81.81');
+      const port = this.configService.get<number>('EMEX_PROXY_PORT_START', 10000);
+      const user = this.configService.get<string>('EMEX_PROXY_USER', '1726bbe361918676d44e');
+      const pass = this.configService.get<string>('EMEX_PROXY_PASS', 'f11c7b6128cc86c6');
+      this.proxyUrl = `http://${user}:${pass}@${host}:${port}`;
+      this.logger.log(`EMEX HTTP proxy enabled: ${host}:${port}`);
+    } else {
+      this.proxyUrl = null;
+    }
+
     this.logger.log(`EMEX Service initialized with scraper path: ${this.scraperPath}`);
   }
 
@@ -227,10 +242,15 @@ export class EmexService {
    * without requiring authentication cookies.
    */
   private async fetchEmexHtml(url: string): Promise<string> {
-    const res = await fetch(url, {
+    // 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),
-    });
+    };
+    if (this.proxyUrl) {
+      options.dispatcher = new ProxyAgent(this.proxyUrl);
+    }
+    const res = await fetch(url, options);
     if (!res.ok) {
       throw new Error(`EMEX HTTP ${res.status} for ${url}`);
     }