feat(nextcloud): integrate Talk & Whiteboard; refactor to NEXTCLOUD_* vars; full-stack setup

config(ports): add Nextcloud websocket port (4003); canonical domains (nextcloud/talk/whiteboard)

refactor: unify get_app_conf usage & Jinja spacing; migrate paths/handlers to new NEXTCLOUD_* vars

feat(plugins): split plugin routines; configure Whiteboard via occ (URL + JWT)

fix(oidc): use NEXTCLOUD_URL for logout; correct LDAP attribute mappings; add OIDC flavor switch

feat: Whiteboard container & reverse-proxy location; Talk STUN/WS ports; Redis URL for Whiteboard

chore: drop obsolete TODO; minor cleanups in oauth2-proxy, matrix, peertube, pgadmin, phpldapadmin, pixelfed, phpmyadmin

security(schema): Bluesky jwt_secret now base64_prefixed_32; add Nextcloud whiteboard_jwt_secret

db: normalize postgres image tag templating; central DB host checks spacing fixes

ops: add full-stack bootstrap (certs, proxy, volumes); internal nginx config reload handler update

refs: https://chatgpt.com/share/68b5f5b7-8d64-800f-b001-1241f818dc0e

roles/web-app-nextcloud/tasks/06_setup_plugin.yml

@@ -0,0 +1,14 @@
+- block:
+    - include_tasks: _plugin_a_routines.yml
+  when: plugin_value.enabled | bool
+
+- name: disable {{ plugin_key }} nextcloud plugin
+  command: "{{ NEXTCLOUD_DOCKER_EXEC_OCC }} app:disable {{ plugin_key }}"
+  register: disable_result
+  changed_when: >
+    not ASYNC_ENABLED and
+    ((disable_result.stdout | default('') ~ disable_result.stderr | default('')) is search('disabled'))
+    and (((disable_result.stdout | default('') ~ disable_result.stderr | default('')) is not search('already disabled')))
+  when: not (plugin_value.enabled | bool)
+  async: "{{ ASYNC_TIME if ASYNC_ENABLED | bool else omit }}"
+  poll:  "{{ ASYNC_POLL if ASYNC_ENABLED | bool else omit }}"