Fix all issues found during first live provisioning run

Traefik:
- Upgrade v3.3 → v3.6 to fix Docker API version negotiation failure
  with Docker Engine 29 (which dropped support for API < 1.40)

Directory permissions:
- Change all service parent directories from 0750 to 0755 so container
  processes can traverse them after dropping from root to a lower UID
- Create db directories owned by postgres UID 999 (mode 0700) so
  PostgreSQL can access its data files across Ansible runs
- Create /opt/gitea/data owned by git UID 1000 (Gitea writes there
  after dropping privileges)

Healthchecks:
- Fix Redis healthcheck: use CMD form instead of CMD-SHELL pipe
  (pipe was unreliable in Alpine)
- Fix Keycloak healthcheck: use bash /dev/tcp on management port 9000
  (curl not available in UBI image; was incorrectly targeting port 8080)

Image tags:
- Fix Roundcube: 1.6 and 1.6-apache do not exist; correct tag is 1.6.x-apache

Bootstrap scripts:
- bootstrap-deploy-user.sh: add sudoers.d entry for passwordless sudo
  (deploy user has no password so sudo group alone was not enough)
- run-bootstrap.sh: read server IP from inventory.ini, chmod 600 keys
  automatically, show actual SSH error on failure

Inventory / config:
- Add ansible_host to inventory.ini — server IP now defined in one place
- Restructure group_vars/ into all/ directory so vault.yml is
  auto-loaded (previously it did not match any group name)
- Move ansible.cfg to repo root (Ansible looks in cwd, not playbook dir)

Docs:
- Split runbook.md into runbook-provisioning.md and
  runbook-configuration.md
- Add step 1 (set server IP) to provisioning runbook
- Expand prerequisites with SSH key generation and upload instructions
- Expand bootstrap step with preflight check details

ansible/roles/nextcloud/tasks/main.yml

@@ -5,14 +5,22 @@
     state: directory
     owner: root
     group: root
-    mode: "0750"
+    mode: "0755"
   loop:
     - "{{ nextcloud_data_dir }}"
     - "{{ nextcloud_data_dir }}/html"
-    - "{{ nextcloud_data_dir }}/db"
     - "{{ nextcloud_data_dir }}/redis"
   tags: nextcloud
 
+- name: Create Nextcloud database directory (postgres UID 999)
+  ansible.builtin.file:
+    path: "{{ nextcloud_data_dir }}/db"
+    state: directory
+    owner: "999"
+    group: "999"
+    mode: "0700"
+  tags: nextcloud
+
 - name: Deploy Docker Compose file
   ansible.builtin.template:
     src: docker-compose.yml.j2