Fix fresh-deploy blockers and clean up architecture

- Seed postfix-accounts.cf before mailserver start to satisfy Dovecot's
  requirement for at least one account on first boot
- Add failed_when: false to mail user/alias list tasks (files don't exist
  on first run)
- Add forgejo_runner_version (was undefined); default to 12
- Create /srv/forgejo/data/gitea/conf before deploying app.ini
- Decouple goaccess sync from restic: new enable_goaccess_sync flag with
  its own goaccess_sync_* variables
- Move Docker installation to bootstrap exclusively; rename docker.yml to
  networks.yml (runs docker_network role only)
- Add radicale_password to vault template and setup.sh
- Fix goaccess sync tasks gated on enable_goaccess_sync
- Add upstream bug comment to authorized_key deprecation warning
- Update CLAUDE.md and README.md throughout

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

roles/dns/tasks/extra_mail_domain.yml

@@ -0,0 +1,56 @@
+---
+- name: "{{ extra_domain }} A record"
+  hetzner.hcloud.zone_rrset:
+    zone: "{{ extra_domain }}"
+    name: "@"
+    type: A
+    ttl: 300
+    records:
+      - value: "{{ server_ip }}"
+    api_token: "{{ hcloud_token }}"
+    state: present
+
+- name: "{{ extra_domain }} MX record"
+  hetzner.hcloud.zone_rrset:
+    zone: "{{ extra_domain }}"
+    name: "@"
+    type: MX
+    ttl: 300
+    records:
+      - value: "10 {{ mail_hostname }}."
+    api_token: "{{ hcloud_token }}"
+    state: present
+
+- name: "{{ extra_domain }} SPF record"
+  hetzner.hcloud.zone_rrset:
+    zone: "{{ extra_domain }}"
+    name: "@"
+    type: TXT
+    ttl: 300
+    records:
+      - value: "{{ 'v=spf1 mx -all' | hetzner.hcloud.txt_record }}"
+    api_token: "{{ hcloud_token }}"
+    state: present
+
+- name: "{{ extra_domain }} DMARC record"
+  hetzner.hcloud.zone_rrset:
+    zone: "{{ extra_domain }}"
+    name: _dmarc
+    type: TXT
+    ttl: 300
+    records:
+      - value: "{{ ('v=DMARC1; p=none; rua=mailto:dmarc@' + extra_domain) | hetzner.hcloud.txt_record }}"
+    api_token: "{{ hcloud_token }}"
+    state: present
+
+- name: "{{ extra_domain }} DKIM record"
+  hetzner.hcloud.zone_rrset:
+    zone: "{{ extra_domain }}"
+    name: mail._domainkey
+    type: TXT
+    ttl: 300
+    records:
+      - value: "{{ dkim_keys[extra_domain] | hetzner.hcloud.txt_record }}"
+    api_token: "{{ hcloud_token }}"
+    state: present
+  when: dkim_keys is defined and extra_domain in dkim_keys