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/sys-front-inj-matomo/README.md

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+# Nginx Matomo Tracking Role
+
+This Ansible role automates the integration of Matomo tracking code into Nginx-served websites. It simplifies the process of adding the Matomo analytics tracking script and image tracker to all your web pages served through Nginx.
+
+## Features
+- Automated insertion of Matomo tracking script into the `</head>` tag of HTML pages.
+- Integration of a noscript image tracker before the `</body>` tag for tracking users with JavaScript disabled.
+- Configuration to apply changes on every request, ensuring that dynamic content and single-page applications are also tracked.
+
+## Requirements
+- Nginx installed on the target server.
+- Matomo analytics platform set up and accessible.
+
+## Dependencies
+- None. This role is designed to be included in Nginx server block configurations.
+
+## Customization
+You can customize the tracking script and the noscript image tracker by editing the `matomo-tracking.js.j2` and `matomo.subfilter.conf.j2` templates.
+
+## Author Information
+This role was created in 2023 by [Kevin Veen Birkenbach](https://www.veen.world/), providing a seamless way to add Matomo analytics to any website served via Nginx.