feat(local-secrets): introduce unified local secrets management and documentation

- Add example secret files for `app_key`, `db_user_password`, and `redis_password`.
- Introduce `local.vault.yml.example` for Ansible Vault encryption of local secrets.
- Create migration and setup scripts for transitioning from `.env.local` to secrets files.
- Update `docker-compose.local.yml` to adopt Docker Secrets and `_FILE` pattern for local configurations.
- Add deployment playbooks and enhanced logging configurations for local development.

Makefile

@@ -37,6 +37,10 @@ reload: ## Dump Autoload & Restart PHP
 	docker compose $(COMPOSE_FILES) exec php composer dump-autoload -o
 	docker compose $(COMPOSE_FILES) restart php
 
+# Local Development Secrets (via Ansible)
+local-secrets: ## Setup Local Development Secrets via Ansible
+	ansible-playbook -i deployment/ansible/inventory/local.yml deployment/ansible/playbooks/setup-local-secrets.yml
+
 # Staging Environment
 up-staging: ## Startet Staging-Container
 	docker compose -f $(COMPOSE_BASE) -f $(COMPOSE_STAGING) up -d