Add container-aware execution logic and CI stability fixes

- Introduce global IS_CONTAINER flag based on ansible_virtualization facts
- Skip systemd-based handlers and tasks when running inside containers
- Extend EXCLUDED_ROLES list in GitHub Actions test-deploy workflow
- Ensure docker.sock is mounted for all CI deploy stages
- Improve sys-svc-docker by suppressing service restarts inside containers
- Add meta: flush_handlers to properly trigger delayed docker restarts
- Update sys-service handlers with container guards
- Update sys-timer tasks to avoid systemctl inside CI containers
- Enhance drv-non-free role with Manjaro detection and mhwd fallback warning
- Skip swapfile generation in containers
- Minor service template fixes and cleanup in proxy.conf.j2

Details and discussion: https://chatgpt.com/share/6930a4ca-56f4-800f-9b3d-4791f040a03b

roles/web-svc-file/templates/proxy.conf.j2

@@ -14,10 +14,10 @@ server
   
   location /
   {
-    alias {{NGINX.DIRECTORIES.DATA.FILES}};  {# Path to your file directory #}
-    autoindex on;                            {# Enable directory listing #}
-    autoindex_exact_size off;                {# Display sizes in a human-readable format #}
-    autoindex_localtime on;                  {# Show local time #}
+    alias {{ NGINX.DIRECTORIES.DATA.FILES }}; {# Path to your file directory #}
+    autoindex on;                             {# Enable directory listing #}
+    autoindex_exact_size off;                 {# Display sizes in a human-readable format #}
+    autoindex_localtime on;                   {# Show local time #}
     {% include 'roles/sys-front-inj-all/templates/location.lua.j2' %}
   }