Update deployment pipeline, Makefile and README

- Makefile: add install_dev, install_prod, migrations, clear_prod, maintenance commands
- Playbook: full deploy flow (maintenance, stop, install, start, migrate, clear, caddy, messenger)
- Supervisor config for 2 messenger instances
- Workflow: SSH key setup with server IP
- hosts.ini: use IP instead of domain, sudo without password
- README: full documentation

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ansible/deploy-caddy.yml

@@ -5,6 +5,12 @@
   vars_files:
     - vault.yml
 
+  pre_tasks:
+    - name: Enable maintenance mode
+      command: make maintenance_on
+      args:
+        chdir: /var/www/e-ticket
+
   tasks:
     - name: Ensure Caddy sites directory exists
       file:
@@ -14,6 +20,31 @@
         group: root
         mode: "0755"
 
+    - name: Stop production containers
+      command: make stop_prod
+      args:
+        chdir: /var/www/e-ticket
+
+    - name: Install dependencies and build assets
+      command: make install_prod
+      args:
+        chdir: /var/www/e-ticket
+
+    - name: Start production containers
+      command: make start_prod
+      args:
+        chdir: /var/www/e-ticket
+
+    - name: Run migrations
+      command: make migrate_prod
+      args:
+        chdir: /var/www/e-ticket
+
+    - name: Clear cache
+      command: make clear_prod
+      args:
+        chdir: /var/www/e-ticket
+
     - name: Deploy Caddy config
       template:
         src: caddy.j2
@@ -23,8 +54,26 @@
         mode: "0644"
       notify: Reload Caddy
 
+    - name: Deploy Messenger supervisor config
+      template:
+        src: messenger.j2
+        dest: /etc/supervisor/conf.d/e-ticket.conf
+        owner: root
+        group: root
+        mode: "0644"
+      notify: Reload Supervisor
+
+  post_tasks:
+    - name: Disable maintenance mode
+      command: make maintenance_off
+      args:
+        chdir: /var/www/e-ticket
+
   handlers:
     - name: Reload Caddy
       systemd:
         name: caddy
         state: reloaded
+
+    - name: Reload Supervisor
+      command: supervisorctl reread && supervisorctl update