fix: resolve all YAML linting errors in playbooks and inventories

- Fix line length violations by using YAML folded strings (>-)
- Remove trailing whitespace from all files
- Add missing document start markers (---) to inventory files
- Improve readability of long Jinja2 template expressions
- Maintain YAML linting compliance for production-ready code

All files now pass yamllint validation successfully.

inventory/production.yml

@@ -1,6 +1,6 @@
 # Production Server Configuration
 # SECURITY: Change all passwords before deployment!
-
+---
 wordpress_servers:
   hosts:
     your-server.example.com:
@@ -9,23 +9,23 @@ wordpress_servers:
       # ansible_ssh_pass: "your_password"  # Use SSH keys instead!
       # ansible_become_pass: "your_sudo_password"  # Use passwordless sudo instead!
       domain_name: example.com
-      
+
       # SSL Configuration
       ssl_enabled: false  # Set to true for HTTPS with Let's Encrypt
       ssl_email: admin@example.com  # Required if ssl_enabled=true
-      
+
       # WordPress Database (CHANGE THESE!)
       mysql_root_password: "CHANGE_ME_ROOT_PASSWORD"
       wordpress_db_name: "wordpress"
       wordpress_db_user: "wp_user"
       wordpress_db_password: "CHANGE_ME_WP_PASSWORD"
-      
+
       # WordPress Admin (CHANGE THESE!)
       wp_admin_user: "admin"
       wp_admin_password: "CHANGE_ME_ADMIN_PASSWORD"
       wp_admin_email: "admin@example.com"
       wp_site_title: "My WordPress Site"
-      
+
       # Ultimate Performance Features (for lemp-wordpress-ultimate.yml)
       enable_redis: false           # Redis object caching
       enable_opcache: false         # PHP OPcache optimization