feat: add git.skudak.com Gitea instance and skudak domain migrations

Gitea Skudak (git.skudak.com):
- New Gitea instance with PostgreSQL in podman pod under git user
- SSH access via Gitea's built-in SSH server on port 2222
- Registration restricted to @skudak.com emails with email confirmation
- SMTP configured for email delivery

Domain migrations:
- wiki.skudakrennsport.com → wiki.skudak.com (302 redirect)
- cloud.skudakrennsport.com + cloud.skudak.com (dual-domain serving)
- BookStack APP_URL updated to wiki.skudak.com
- Nextcloud trusted_domains updated for cloud.skudak.com

Infrastructure:
- SELinux context for git user container storage (container_file_t)
- Firewall rule for port 2222/tcp (Gitea Skudak SSH)
- Caddy reverse proxy for git.skudak.com

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

ansible/roles/podman/tasks/containers/skudak/cloud.yml

@@ -119,3 +119,14 @@
     insertbefore: '^\);'
     create: false
   failed_when: false
+
+# Add cloud.skudak.com to Nextcloud trusted_domains
+- name: add cloud.skudak.com to nextcloud trusted_domains
+  become: true
+  become_user: "{{ podman_user }}"
+  ansible.builtin.command: >
+    podman exec -u www-data skudak-cloud
+    php occ config:system:set trusted_domains 1 --value="cloud.skudak.com"
+  register: trusted_domain_result
+  changed_when: "'System config value trusted_domains' in trusted_domain_result.stdout"
+  failed_when: false