Refactor: Organize Ansible project structure

- Reorganized Ansible project structure to follow best practices.
- Created dedicated directories: , , , , and .
- Categorized playbooks into  (host-specific) and  (service-specific).
- Moved all roles into the  directory and standardized their naming conventions.
- Relocated  to  for better variable management.
- Renamed  to  to reflect its global variable scope.
- Created  to correctly set the  to the new  directory.
- Moved  and  into the  directory.
- Added  to  providing explanations for common commands.
- Cleaned up  directories from all individual roles to centralize version control.

roles/security/tasks/fail2ban.yml

@@ -0,0 +1,29 @@
+---
+- name: Install fail2ban (RedHat).
+  package:
+    name: fail2ban
+    state: present
+    enablerepo: epel
+  when: ansible_os_family == 'RedHat'
+
+- name: Install fail2ban (Debian).
+  package:
+    name: fail2ban
+    state: present
+  when: ansible_os_family == 'Debian'
+
+- name: Copy fail2ban custom configuration file into place.
+  template:
+    src: "{{ security_fail2ban_custom_configuration_template }}"
+    dest: /etc/fail2ban/jail.local
+    owner: root
+    group: root
+    mode: 0644
+  notify:
+    - reload fail2ban
+
+- name: Ensure fail2ban is running and enabled on boot.
+  service:
+    name: fail2ban
+    state: started
+    enabled: true