Refactor: Migrate deprecated Ansible facts to ansible_facts[] syntax

Why:
- Ansible 2.20+ deprecates INJECT_FACTS_AS_VARS and direct usage of top-level ansible_* facts.
- This change updates all affected roles and vars files to the new supported syntax.
- Ensures compatibility with upcoming Ansible 2.24 removal of implicit fact injection.

Conversation reference:
https://chatgpt.com/share/692f639b-1380-800f-9f18-732f7108e9e2

roles/svc-net-wireguard-core/tasks/main.yml

@@ -2,13 +2,13 @@
   community.general.pacman: 
     name:   wireguard-tools
     state:  present
-  when: ansible_os_family == "Archlinux"
+  when: ansible_facts['os_family'] == "Archlinux"
 
 - name: install wireguard for Ubuntu
   apt: 
     name:   wireguard
     state:  present
-  when: ansible_os_family == "Debian"
+  when: ansible_facts['os_family'] == "Debian"
 
 - name: create wireguard-ip.conf
   copy: