feat(frontend): rename inj roles to sys-front-*, add sys-svc-cdn, cache-busting lookup

Introduce sys-svc-cdn (cdn_paths/cdn_urls/cdn_dirs) and ensure CDN directories + latest symlink.

Rename sys-srv-web-inj-* → sys-front-inj-*; update includes/templates; serve shared/per-app CSS & JS via CDN.

Add lookup_plugins/local_mtime_qs.py for mtime-based cache busting; split CSS into default.css/bootstrap.css + optional per-app style.css.

CSP: use style-src-elem; drop unsafe-inline for styles. Services: fix SYS_SERVICE_ALL_ENABLED bool and controlled flush.

BREAKING CHANGE: role names changed; replace includes and references accordingly.

Conversation: https://chatgpt.com/share/68b55494-9ec4-800f-b559-44707029141d

roles/srv-composer/README.md

@@ -2,7 +2,7 @@
 
 This Ansible role composes and orchestrates all necessary HTTPS-layer tasks and HTML-content injections for your webserver domains. It integrates two key sub-roles into a unified workflow:
 
-1. **`sys-srv-web-inj-compose`**
+1. **`sys-front-inj-all`**
    Injects global HTML snippets (CSS, Matomo tracking, iFrame notifier, custom JavaScript) into responses using Nginx `sub_filter`.
 2. **`sys-svc-certs`**
    Handles issuing, renewing, and managing TLS certificates via ACME/Certbot.

roles/srv-composer/tasks/main.yml

@@ -1,8 +1,8 @@
 # run_once_srv_composer: deactivated
 
-- name: "include role sys-srv-web-inj-compose for '{{ domain }}'"
+- name: "include role sys-front-inj-all for '{{ domain }}'"
   include_role: 
-    name: sys-srv-web-inj-compose
+    name: sys-front-inj-all
 
 - name: "include role sys-svc-certs for '{{ domain }}'"
   include_role: