fix(config): default port to 7860 to match Hugging Face Space app_port configuration

app/config.py

@@ -39,7 +39,7 @@ AGENT_DELIVERY_VERIFICATION = "delivery_verification"
 AGENT_FEEDBACK_FOLLOWUP = "feedback_followup"
 
 SERVER_HOST = "0.0.0.0"
-SERVER_PORT = int(os.getenv("PORT", 8000))
+SERVER_PORT = int(os.getenv("PORT", 7860))
 
 SAMPLE_RATE = 16000
 TTS_SAMPLE_RATE = 24000