feat(infrastructure): add terraform example

tofu/terraform.tfvars.example

@@ -0,0 +1,22 @@
+# Example terraform.tfvars for MariaDB and MetalLB
+
+metallb_ip_range = "10.80.0.100-10.80.0.240"
+
+# Secret configuration (use strong passwords; do not commit real secrets)
+mariadb_password      = "example_password"
+mariadb_root_password = "example_root_password"
+
+# MariaDB user
+mariadb_user_name     = "example_user"
+mariadb_user_host     = "%"
+mariadb_user_password = "example_user_password"
+
+# MetalLB IPs for services (optional)
+metallb_maxscale_ip  = "10.80.0.219"
+metallb_service_ip   = "10.80.0.120"
+metallb_primary_ip   = "10.80.0.130"
+metallb_secondary_ip = "10.80.0.131"
+
+# phpMyAdmin toggle
+phpmyadmin_enabled = true
+