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-desktop/README.md

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+
+# 🌐 iFrame Notifier for Nginx
+
+This Ansible role injects a small JavaScript snippet into your HTML responses that enables parent pages to get notified whenever the iframe’s location changes and forces external links to open in a new tab.
+
+---
+
+## Features
+
+- **Location Change Notification**  
+  Uses `postMessage` to inform the parent window of any URL changes inside the iframe (including pushState/popState events) for seamless SPA support.
+
+- **External Link Handling**  
+  Automatically sets `target="_blank"` and `rel="noopener"` on links pointing outside your primary domain to improve security and user experience.
+
+- **Easy CSP Integration**  
+  Calculates a CSP hash for the injected script so you can safely allow it via your Content Security Policy.
+
+---
+
+## Author
+
+Developed by **Kevin Veen-Birkenbach**
+[https://www.veen.world](https://www.veen.world) 🎉