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/templates/style.css.j2

@@ -0,0 +1,21 @@
+.card-img-top i {
+    filter: drop-shadow(4px 4px 4px rgba(var(--color-01-rgb-23), 0.6));
+}
+
+.kanban-table-body .kanban-uses-box {
+    background-color: var(--color-01-81);
+}
+
+.kanban-swimlane-title {
+    border-bottom: none;
+}
+
+.navbar-toggler {
+    background-color:   rgba(var(--color-01-rgb-75), 0.9);
+    border-color:       var(--color-01-67)
+}
+
+.sys-ctl-alm-info {
+    --bs-sys-ctl-alm-color: var(--color-03-14);
+    --bs-sys-ctl-alm-bg: var(--color-01-86);
+}