Update default application port to 5555

Change the default exposed port and environment variable PORT from 5000 to 5555 in Dockerfile and docker-compose.yml.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: ae4037a0-2a6f-4530-9bac-79b543286bda
Replit-Commit-Checkpoint-Type: full_checkpoint
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docker-compose.yml

@@ -34,14 +34,14 @@ services:
     # Port non exposé publiquement car nginx reverse proxy accède via le réseau Docker
     # Décommentez si vous avez besoin d'accéder directement sans nginx :
     # ports:
-    #   - "${PORT:-5000}:5000"
+    #   - "${PORT:-5555}:5555"
     environment:
       NODE_ENV: production
-      PORT: 5000
+      PORT: 5555
       DATABASE_URL: postgresql://${PGUSER:-socialflow}:${PGPASSWORD:-changeme}@postgres:5432/${PGDATABASE:-socialflow}
       OPENROUTER_API_KEY: ${OPENROUTER_API_KEY}
       SESSION_SECRET: ${SESSION_SECRET:-your-secret-key-change-me}
-      APP_URL: ${APP_URL:-http://localhost:5000}
+      APP_URL: ${APP_URL:-http://localhost:5555}
     networks:
       - internal
       - nginx_default