nextcloud(role): remove async → use batched shell; more robust changed_when/failed_when; fix quoting; refactor plugin routines; clean up vars

• 02_add_missing_indices.yml: switched to shell (+ansible_command_timeout), removed async/poll.

• 04_system_config.yml: batch OCC calls (set -euo pipefail, /bin/bash), safer quoting, change detection via ' set to '.

• 05_plugin.yml: disable task with stricter failed_when/changed_when (combine stdout+stderr).

• 06_plugin_routines.yml: disable incompatible plugins in a single batch; no async_status; robust changed_when.

• 07_plugin_enable_and_configure.yml: batch config:app:set, safe quoting, clear changed_when/failed_when.

• config/main.yml & vars/main.yml: removed performance.async.wait_for and nextcloud_wait_for_async_enabled.

roles/web-app-nextcloud/tasks/02_add_missing_indices.yml

@@ -1,17 +1,13 @@
-- name: "Launch async: add missing DB indices in Nextcloud"
-  ansible.builtin.command: >
+- name: "Add missing DB indices in Nextcloud (single run)"
+  ansible.builtin.shell: |
+    set -e
     {{ nextcloud_docker_exec_occ }} db:add-missing-indices
-  async: 3600
-  poll: 0
-  register: db_indices_job
-
-- name: "Wait for DB indices job"
-  ansible.builtin.async_status:
-    jid: "{{ db_indices_job.ansible_job_id }}"
+  args:
+    executable: /bin/bash
+  vars:
+    # Give the command enough time without async/poll overhead
+    ansible_command_timeout: 3600
   register: db_indices_result
-  until: db_indices_result.finished
-  retries: 600
-  delay: 1
   failed_when: db_indices_result.rc != 0
   changed_when: >
     ('Adding additional' in (db_indices_result.stdout | default(''))) or