feat(lexware): add integration foundation

docker-compose.yml

@@ -35,6 +35,9 @@ services:
       SMTP_FROM_EMAIL: ${SMTP_FROM_EMAIL:-}
       SMTP_FROM_NAME: ${SMTP_FROM_NAME:-Funktechnik Schubert}
       SMTP_USE_TLS: ${SMTP_USE_TLS:-true}
+      LEXWARE_ENABLED: ${LEXWARE_ENABLED:-false}
+      LEXWARE_API_BASE_URL: ${LEXWARE_API_BASE_URL:-https://api.lexware.io}
+      LEXWARE_API_KEY: ${LEXWARE_API_KEY:-}
 
     volumes:
       - ${STORAGE_HOST_PATH:-./storage}:/data/storage