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-javascript/README.md

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+# 🌐 Global JavaScript Injector for Nginx
+
+## Description
+
+This Ansible role injects a custom JavaScript snippet into all HTML responses served by Nginx. It leverages Nginx’s `sub_filter` to seamlessly insert your application-specific script just before the closing `</head>` tag, ensuring that your code runs on every page load—perfect for global feature flags, analytics, or UI enhancements.
+
+## Features
+
+- **One-line Script Injection**  
+  Collapses your JavaScript into a single line and injects it via `sub_filter` for minimal footprint and maximal compatibility.
+
+- **Easy CSP Integration**  
+  Automatically computes and appends a CSP hash entry for your script, so you can lock down Content Security Policy without lifting a finger.
+
+- **Conditional Activation**  
+  Activates only when you enable the `javascript` feature for a given application, keeping your server blocks clean and performant.
+
+- **Debug Mode**  
+  Supports an `MODE_DEBUG` flag that appends optional `console.log` statements for easier troubleshooting in staging or development.
+
+## Author
+
+Developed by **Kevin Veen-Birkenbach**
+Consulting & Coaching Solutions — [veen.world](https://www.veen.world)
+
+---
+
+Happy automating! 🎉