chore: Update Dockerfiles, Makefile and documentation

- Updated Dockerfile.production
- Updated Makefile
- Updated deployment documentation
- Updated docker/ci/Dockerfile, docker/php/Dockerfile, docker/worker/Dockerfile
- Updated dependency scanning documentation
- Added git-hooks documentation

docker/php/Dockerfile

@@ -1,5 +1,7 @@
 # Dockerfile für PHP-FPM
-FROM php:8.5.0RC3-fpm AS base
+ARG PHP_VERSION=8.5.0RC3
+# Override via --build-arg PHP_VERSION=8.5.0RCX to track upstream releases
+FROM php:${PHP_VERSION}-fpm AS base
 
 # System-Abhängigkeiten: Werden selten geändert, daher ein eigener Layer
 RUN apt-get update && apt-get install -y \
@@ -155,7 +157,8 @@ COPY tsconfig.json ./
 RUN npm run build
 
 # Stage: Production Runtime
-FROM php:8.5.0RC3-fpm AS production
+ARG PHP_VERSION=8.5.0RC3
+FROM php:${PHP_VERSION}-fpm AS production
 
 # Install system dependencies + nginx for production
 RUN apt-get update && apt-get install -y \