Add Postiz service integration and configuration

- Introduced Postiz as a new service in docker-compose.yml, including necessary environment variables and volume configurations.
- Updated Caddyfile to set up reverse proxy for Postiz.
- Enhanced README.md to document Postiz and its hostname for user reference.
- Modified scripts to include Postiz in the service selection wizard and final report for improved user guidance.

scripts/04_wizard.sh

@@ -55,6 +55,7 @@ base_services_data=(
     "flowise" "Flowise (AI Agent Builder)"
     "monitoring" "Monitoring Suite (Prometheus, Grafana, cAdvisor, Node-Exporter)"
     "portainer" "Portainer (Docker management UI)"
+    "postiz" "Postiz (Social publishing platform)"
     "langfuse" "Langfuse Suite (AI Observability - includes Clickhouse, Minio)"
     "qdrant" "Qdrant (Vector Database)"
     "supabase" "Supabase (Backend as a Service)"

scripts/06_final_report.sh

@@ -135,6 +135,14 @@ if is_profile_active "portainer"; then
   echo "(Note: On first login, Portainer will prompt to set up an admin user.)"
 fi
 
+if is_profile_active "postiz"; then
+  echo
+  echo "================================= Postiz =============================="
+  echo
+  echo "Host: ${POSTIZ_HOSTNAME:-<hostname_not_set>}"
+  echo "Note: Configure Postgres/Redis in /config/.env inside the container on first run."
+fi
+
 if is_profile_active "ragapp"; then
   echo
   echo "================================= RAGApp =============================="