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/mail/tasks/main.yml

@@ -92,15 +92,32 @@
     name: certbot
     state: present
 
+- name: Check if mail TLS certificate already exists
+  ansible.builtin.stat:
+    path: /etc/letsencrypt/live/{{ mail_hostname }}/fullchain.pem
+  register: mail_cert
+
+- name: Stop Caddy to free port 80 for certbot
+  community.docker.docker_compose_v2:
+    project_src: /srv/caddy
+    state: stopped
+  when: not mail_cert.stat.exists
+
 - name: Obtain a Let's Encrypt certificate for {{ mail_hostname }}
   command: >
     certbot certonly --standalone
     -d {{ mail_hostname }}
     --non-interactive --agree-tos -m postmaster@{{ domain }}
-  args:
-    creates: /etc/letsencrypt/live/{{ mail_hostname }}/fullchain.pem
+  when: not mail_cert.stat.exists
   tags: config
 
+- name: Restart Caddy after certbot
+  community.docker.docker_compose_v2:
+    project_src: /srv/caddy
+    state: present
+    build: never
+  when: not mail_cert.stat.exists
+
 - name: Deploy mail compose file
   template:
     src: compose.yml.j2
@@ -126,6 +143,17 @@
   notify: Restart mailserver
   tags: config
 
+- name: Seed mail accounts into postfix-accounts.cf before first start
+  ansible.builtin.shell: |
+    grep -qF "{{ item.address }}" /srv/mail/config/postfix-accounts.cf 2>/dev/null && exit 0
+    hash=$(openssl passwd -6 {{ item.password | quote }})
+    printf '%s|{SHA512-CRYPT}%s\n' "{{ item.address }}" "${hash}" >> /srv/mail/config/postfix-accounts.cf
+  loop: "{{ mail_users }}"
+  no_log: true
+  args:
+    executable: /bin/bash
+  tags: users
+
 - name: Start mailserver
   community.docker.docker_compose_v2:
     project_src: /srv/mail