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

roles/caddy/meta/main.yml

@@ -0,0 +1,15 @@
+---
+galaxy_info:
+  role_name: caddy
+  author: rick-infra
+  description: Caddy web server and reverse proxy
+  min_ansible_version: 2.9
+  platforms:
+    - name: ArchLinux
+      versions:
+        - all
+
+dependencies: []
+
+collections:
+  - ansible.posix