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/web-app-desktop/config/main.yml

@@ -13,7 +13,7 @@ server:
         - https://cdn.jsdelivr.net
         - https://kit.fontawesome.com
         - https://code.jquery.com/
-      style-src:
+      style-src-elem:
         - https://cdn.jsdelivr.net
       font-src:
         - https://ka-f.fontawesome.com
@@ -24,12 +24,8 @@ server:
       frame-src:
         - "{{ WEB_PROTOCOL }}://*.{{ PRIMARY_DOMAIN }}"
     flags:
-      style-src:
-        unsafe-inline: true
       script-src:
         unsafe-inline: true
-      script-src-elem:
-        unsafe-inline: true
   domains:
     canonical:
       - "{{ PRIMARY_DOMAIN }}"