Change webhook receiver port from 5000 to 5555 to avoid conflicts

Issue: Port 5000 often in use (AirPlay, other apps)
Solution: Changed default webhook port to 5555

Changes:
- .env: Added WEBHOOK_RECEIVER_PORT=5555
- config.yaml: Changed port to ${WEBHOOK_RECEIVER_PORT:-5555}
- Default is now 5555 instead of 5000
- Configurable via .env file

A2→A3 Webhook Server:
✅ Starts successfully on port 5555
✅ All connections OK (DAM, Box, Database)
✅ Background worker running
✅ Ready to receive Box webhooks

Access webhook at: http://server:5555/webhooks/box

🤖 Generated with Claude Code

Python-Version/.env

@@ -42,5 +42,6 @@ MAILGUN_DOMAIN=mail.dev.oliver.solutions
 # Webhook Configuration
 CAMPAIGN_STATUS_WEBHOOK_URL=https://hook.us1.make.celonis.com/3f9ztwl8qnljufo0l65utfv5wvvnt9m5
 WEBHOOK_AUTH_TOKEN=
+WEBHOOK_RECEIVER_PORT=5555
 BOX_WEBHOOK_PRIMARY_KEY=your_box_webhook_primary_key
 BOX_WEBHOOK_SECONDARY_KEY=your_box_webhook_secondary_key

Python-Version/config/config.yaml

@@ -45,7 +45,7 @@ polling:
 webhook_receiver:
   enabled: true
   host: 0.0.0.0
-  port: 5000
+  port: ${WEBHOOK_RECEIVER_PORT:-5555}
   validate_signatures: true
 
 # Outgoing Webhooks (we call these)