feat: complete n8n stack setup

Docker Compose stack (n8n, PostgreSQL 16, Redis 7, 1 worker) with:
- nginx local proxy on port 8088, YunoHost TLS termination config
- helper scripts: backup/restore/import/export/update
- .env.example, README with architecture, ops commands, to-do list

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

scripts/import-workflow.sh

@@ -0,0 +1,35 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+ROOT="$(dirname "$SCRIPT_DIR")"
+COMPOSE="$ROOT/compose/docker-compose.yml"
+
+if [ -z "${1:-}" ]; then
+  echo "Verwendung: $0 <workflow.json | verzeichnis/>"
+  exit 1
+fi
+
+SOURCE="$1"
+
+if [ -d "$SOURCE" ]; then
+  # Verzeichnis: alle JSON-Dateien importieren
+  echo "[import-workflow] Importiere alle Workflows aus: $SOURCE"
+  for f in "$SOURCE"/*.json; do
+    [ -f "$f" ] || continue
+    DEST="$ROOT/imports/workflows/$(basename "$f")"
+    cp "$f" "$DEST"
+    echo "[import-workflow] → $(basename "$f")"
+    docker compose -f "$COMPOSE" exec n8n \
+      n8n import:workflow --input="/imports/workflows/$(basename "$f")"
+  done
+else
+  # Einzelne Datei
+  DEST="$ROOT/imports/workflows/$(basename "$SOURCE")"
+  cp "$SOURCE" "$DEST"
+  echo "[import-workflow] Importiere: $(basename "$SOURCE")"
+  docker compose -f "$COMPOSE" exec n8n \
+    n8n import:workflow --input="/imports/workflows/$(basename "$SOURCE")"
+fi
+
+echo "[import-workflow] Fertig."