Centralize users list in group_vars and rename baseline playbook

Move the canonical user list to group_vars/all/users.yml so both
setup_linux.yml (renamed from initial_setup.yml) and the
initial_install users role consume the same source of truth.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

initial_install/roles/users/tasks/main.yml

@@ -1,28 +1,5 @@
 ---
-- name: Define users
-  ansible.builtin.set_fact:
-    users:
-      - name: automation
-        shell: /bin/bash
-        sudo_nopasswd: true
-        ssh_keys:
-          - "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIEx+ltCKNIEM7F4PzGLv22cIu7N0Fpn5gxwV02xq0GS9 automation@internet-master.cz"
-
-      - name: hellsos
-        shell: /bin/bash
-        sudo_nopasswd: true
-        ssh_keys:
-          - "ssh-ed25519 AAAAC3..."
-
-      - name: jim
-        shell: /bin/bash
-        sudo_nopasswd: true
-        ssh_keys:
-          - "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIPFS4fsqMjMMu/Bi/884bw7yJBqvWusDRESvanH6Owco jakub@jimbuntu"
-
-# --------------------------------------------------
-# Create users
-# --------------------------------------------------
+# `users` comes from group_vars/all/users.yml
 - name: Ensure users exist
   ansible.builtin.user:
     name: "{{ item.name }}"