Fix Nextcloud Talk Recording volumes and fully enable external DB/Redis integration for ONLYOFFICE.

Includes:
- Talk recording tmp volume wiring for Nextcloud
- ONLYOFFICE external PostgreSQL/Redis env integration
- Added explicit volumes for pgdata/redis/rabbitmq
- Switched ONLYOFFICE role to sys-stk-full-stateful
- Updated docker-compose mounts and vars
- CSP and feature flag improvements

Conversation reference: https://chatgpt.com/share/6922f50e-cc44-800f-89fc-e1251c5bbe45

roles/web-app-nextcloud/config/main.yml

@@ -42,6 +42,7 @@ docker:
     data:                   nextcloud_data
     whiteboard_tmp:         nextcloud_whiteboard_tmp
     whiteboard_fontcache:   nextcloud_whiteboard_fontcache
+    talk_recording_tmp:     nextcloud_talk_recording_tmp
   services:
     redis:
       enabled:              true