Complete production-ready Caddy infrastructure with security hardening

- Add comprehensive Caddy role with HTTPS/TLS, DNS challenges, and systemd security
- Implement optimized systemd overrides with enhanced security restrictions
- Create detailed documentation with usage examples and variable references
- Establish proper Ansible configuration with vault integration
- Update site.yml for infrastructure orchestration with role-based deployment
- Add host-specific configuration structure for scalable multi-environment setup

site.yml

@@ -1,5 +1,13 @@
 ---
-- name: Setting up VPS
+- name: Secure VPS Infrastructure Setup  
   hosts: arch-vps
   become: yes
   gather_facts: yes
+  
+  roles:
+    - role: caddy
+      tags: ['caddy', 'web', 'https']
+  
+  # Optional: Include security playbook
+  # - import_playbook: playbooks/security.yml
+  #   tags: ['security', 'firewall', 'ssh']