fix(proxy): Use correct Evomi host rp.evomi.com

Was using rpc.evomi.com which doesn't exist.
Residential proxies use rp.evomi.com:1000

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/src/services/crawl-rotator.ts

@@ -952,7 +952,7 @@ export function getEvomiConfig(): EvomiConfig {
     enabled: !!(user && pass),
     user,
     pass,
-    host: process.env.EVOMI_HOST || 'rpc.evomi.com',
+    host: process.env.EVOMI_HOST || 'rp.evomi.com',
     port: parseInt(process.env.EVOMI_PORT || '1000', 10),
     sessionLifetimeMinutes: parseInt(process.env.EVOMI_SESSION_LIFETIME || '30', 10),
   };