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/sys-svc-rdbms/templates/services/postgres.yml.j2

@@ -2,7 +2,7 @@
 
 {% if not applications | get_app_conf(application_id, 'features.central_database', False) %}  
   {{ database_host }}:
-    image: postgres:{{applications['svc-db-postgres'].version}}-alpine
+    image: postgres:{{ applications['svc-db-postgres'].version}}-alpine
     container_name: {{ application_id | get_entity_name }}-database
     env_file:
       - {{database_env}}