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-logout/README.md

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+# sys-front-inj-logout
+
+This role injects a catcher that intercepts all logout elements in HTML pages served by Nginx and redirects them to a centralized logout endpoint via JavaScript.
+
+## Description
+
+The `sys-front-inj-logout` Ansible role automatically embeds a lightweight JavaScript snippet into your web application's HTML responses. This script identifies logout links, buttons, forms, and other elements, overrides their target URLs, and ensures users are redirected to a central OIDC logout endpoint, providing a consistent single sign‑out experience.
+
+## Overview
+
+- **Detection**: Scans the DOM for anchors (`<a>`), buttons, inputs, forms, `use` elements and any attributes indicating logout functionality.  
+- **Override**: Rewrites logout URLs to point at your OIDC provider’s logout endpoint, including a redirect back to the application.  
+- **Dynamic content support**: Uses a `MutationObserver` to handle AJAX‑loaded or dynamically injected logout elements.  
+- **CSP integration**: Automatically appends the required script hash into your CSP policy via the role’s CSP helper.
+
+## Features
+
+- Seamless injection via Nginx `sub_filter` on `</head>`.  
+- Automatic detection of various logout mechanisms (links, buttons, forms).  
+- Centralized logout redirection for a unified user experience.  
+- No changes required in application code.  
+- Compatible with SPAs and dynamically generated content.  
+- CSP‑friendly: manages script hash for you.
+
+## Further Resources
+
+- [OpenID Connect RP-Initiated Logout](https://openid.net/specs/openid-connect-session-1_0.html#RPLogout)  
+- [Nginx `sub_filter` Module](http://nginx.org/en/docs/http/ngx_http_sub_module.html)  
+- [Ansible Role Directory Structure](https://docs.ansible.com/ansible/latest/user_guide/playbooks_roles.html#role-directory-structure)