feat(deploy): enhance deployment scripts with skip options for backend and frontend

- Updated `deploy-yourpart-bluegreen.sh` to pass additional arguments for skipping backend or frontend updates.
- Enhanced `update.sh` to handle `--skip-backend` and `--skip-frontend` flags, allowing for more flexible deployment based on changes detected.
- Modified deployment workflow to conditionally execute based on changes in frontend or backend files, improving deployment efficiency.

update.sh

@@ -2,10 +2,33 @@
 set -euo pipefail
 
 TARGET_DIR="${1:?Zielverzeichnis fehlt: ./update.sh <z. B. /opt/yourpart-green>}"
+shift || true
+
+SKIP_BACKEND="0"
+SKIP_FRONTEND="0"
+
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    --skip-backend)
+      SKIP_BACKEND="1"
+      ;;
+    --skip-frontend)
+      SKIP_FRONTEND="1"
+      ;;
+    *)
+      echo "Unbekannte Option: $1" >&2
+      echo "Verwendung: ./update.sh <target-dir> [--skip-backend] [--skip-frontend]" >&2
+      exit 1
+      ;;
+  esac
+  shift
+done
 
 echo "=== YourPart Update Script ==="
 echo "Ziel-Slot: $TARGET_DIR"
 echo "Aktualisiert die Anwendung, ohne .env-Dateien zu überschreiben"
+echo "Skip Backend:  $SKIP_BACKEND"
+echo "Skip Frontend: $SKIP_FRONTEND"
 echo ""
 
 # Prüfen ob wir im richtigen Verzeichnis sind
@@ -36,13 +59,23 @@ if ! command -v sudo >/dev/null 2>&1; then
     exit 1
 fi
 
-echo ""
-echo "=== Updating Backend ==="
-./update-backend.sh "$TARGET_DIR"
+if [[ "$SKIP_BACKEND" == "1" ]]; then
+    echo ""
+    echo "=== Backend-Update übersprungen (--skip-backend) ==="
+else
+    echo ""
+    echo "=== Updating Backend ==="
+    ./update-backend.sh "$TARGET_DIR"
+fi
 
-echo ""
-echo "=== Building and Updating Frontend ==="
-./update-frontend.sh "$TARGET_DIR"
+if [[ "$SKIP_FRONTEND" == "1" ]]; then
+    echo ""
+    echo "=== Frontend-Build/Update übersprungen (--skip-frontend) ==="
+else
+    echo ""
+    echo "=== Building and Updating Frontend ==="
+    ./update-frontend.sh "$TARGET_DIR"
+fi
 
 echo ""
 echo "Link backend .env"