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-css/tasks/main.yml

@@ -0,0 +1,25 @@
+- block:
+    - include_tasks: 01_core.yml
+    - include_tasks: utils/run_once.yml
+  when: run_once_sys_front_inj_css is not defined
+
+- name: "Resolve optional app style.css source for '{{ application_id }}'"
+  vars:
+    app_role_dir: "{{ playbook_dir }}/roles/{{ application_id }}"
+    _app_style_src: >-
+      {{ lookup('first_found', {
+           'files': ['templates/style.css.j2','files/style.css'],
+           'paths': [app_role_dir]
+         }, errors='ignore') | default('', true) }}
+  set_fact:
+    app_style_src: "{{ _app_style_src }}"
+    app_style_present: "{{ _app_style_src | length > 0 }}"
+
+- name: "Deploy per-app '{{ app_style_src }}' to '{{ css_app_dst }}'"
+  when: app_style_present
+  copy:
+    content:  "{{ lookup('template', app_style_src) }}"
+    dest:     "{{ css_app_dst }}"
+    owner:    "{{ NGINX.USER }}"
+    group:    "{{ NGINX.USER }}"
+    mode:     '0644'