feat(global_defaults): add os_family_map and os_family fact for platform config lookups

roles/global_defaults/tasks/main.yml

@@ -20,6 +20,7 @@
   ansible.builtin.set_fact:
     is_rhel: "{{ os in os_family_rhel }}"
     is_debian: "{{ os in os_family_debian }}"
+    os_family: "{{ os_family_map[os] | default('Unknown') }}"
 
 - name: Normalize OS version for keying
   when: