refactor(build): remove docker-compose hardcoded file, update compose dependencies, and resolve library conflicts

Deleted the unused `compose.hardcoded.yaml` file. Updated Gradle build scripts to resolve issues with Jackson and Resilience4j library bundles by explicitly specifying direct dependencies. Removed the `sqldelight` plugin and related dependencies from `local-db` module. Consolidated `docker-compose.yaml` to standardize restart policies. Adjusted `.env` to include cautions for sensitive data and rechecked Java version comments.

.env

@@ -2,6 +2,8 @@
 #  Meldestelle – Docker Compose Environment
 #  Single Source of Truth (SSoT)
 # ==========================================
+# WARNING: This file contains secrets (passwords).
+# Do NOT commit this file to version control if it contains production secrets.
 
 # --- PROJECT ---
 PROJECT_NAME=meldestelle
@@ -11,6 +13,7 @@ RESTART_POLICY=no
 DOCKER_VERSION=1.0.0-SNAPSHOT
 DOCKER_BUILD_DATE=2025-12-22T15:00:00Z
 DOCKER_GRADLE_VERSION=9.2.1
+# Check if 25 is intended (Early Access) or if LTS 21 was meant
 DOCKER_JAVA_VERSION=25
 DOCKER_NODE_VERSION=24.12.0
 DOCKER_NGINX_VERSION=1.28.0-alpine