added entrypoint for docker

.env.template

@@ -0,0 +1,16 @@
+# === SCHICHTPLANER DOCKER COMPOSE ENVIRONMENT VARIABLES ===
+# Diese Datei wird von docker-compose automatisch geladen
+
+# Security
+JWT_SECRET=${JWT_SECRET:-your-secret-key-please-change}
+NODE_ENV=${NODE_ENV:-production}
+
+# Database
+DB_PATH=${DB_PATH:-/app/data/database.db}
+
+# Server
+PORT=${PORT:-3002}
+
+# App Configuration
+APP_TITLE="Shift Planning App"
+ENABLE_PRO=${ENABLE_PRO:-false}