Refactor portainer configuration: standardize ansible_password, simplify SSH arguments, and clean up inventory group naming.

nextcloud/check_stack_nextcloud.yml

@@ -8,9 +8,9 @@
     - name: Ensure docker CLI is available
       ansible.builtin.command:
         argv: ["/usr/bin/env", "bash", "-lc", "command -v docker"]
+      register: docker_check
       changed_when: false
-      failed_when: result.rc != 0
-      register: result
+      failed_when: docker_check.rc != 0
       # English: Hard fail if docker is not present.
 
     - name: Verify Nextcloud container is running