Treat omitted host_apps.enabled as true (#36)

Closes #35.

## Summary
- `#33` used Jinja `rejectattr('enabled', 'equalto', false)` to skip stopped apps. That filter **requires** the key, so every `host_apps` row that omits `enabled` (the documented default) crashed deploy on all webservers before git/compose.
- Filter with `item.enabled | default(true)` instead, in `app-deploy` and `web-static`. `print_forge` (`enabled: false`) still skipped. `url_shortening_service` and every other omitted-key row deploy again.

## Test plan
- [ ] `ansible-playbook playbooks/deploy-apps.yml --syntax-check`
- [ ] Redeploy `url_shortening_service` beta: `deploy.sh --app url_shortening_service --env beta --ref <sha>`
- [ ] Confirm `print_forge` is still not started (no compose up on 8007/8019)

Reviewed-on: #36

roles/web-static/tasks/main.yml

@@ -6,9 +6,20 @@
   ansible.builtin.set_fact:
     _node_names: "{{ app_catalog | dict2items | selectattr('value.type', 'equalto', 'node-static') | map(attribute='key') | list }}"
 
+# rejectattr('enabled', …) raises when the key is omitted. Omit = enabled (#35).
+- name: web-static | reset static apps
+  ansible.builtin.set_fact:
+    _static_apps: []
+
 - name: web-static | this host's static apps
   ansible.builtin.set_fact:
-    _static_apps: "{{ host_apps | default([]) | rejectattr('enabled', 'equalto', false) | selectattr('name', 'in', _node_names) | list }}"
+    _static_apps: "{{ _static_apps + [item] }}"
+  loop: "{{ host_apps | default([]) }}"
+  when:
+    - item.name in _node_names
+    - item.enabled | default(true)
+  loop_control:
+    label: "{{ item.name }}/{{ item.env }}"
 
 - name: web-static | configure and run
   when: _static_apps | length > 0