feat(delivery): add Ansible playbook for native MySQL provisioning

Add mysql-deploy.yml playbook for bare-metal MySQL 8.0 delivery via
AWX: parameter validation, resource preflight checks, apt install,
AppArmor adaptation, per-instance directory layout, Jinja2 config
template (buffer pool sizing, binlog, GTID), systemd template unit
(mysql-delivery@.service), admin account setup, and TCP health
verification. Includes example inventory.

Relates-to: #97

ansible/inventory.example.yml

@@ -0,0 +1,11 @@
+all:
+  children:
+    mysql_hosts:
+      hosts:
+        k8s-server-01: { ansible_host: 192.168.1.4 }
+        k8s-server-02: { ansible_host: 192.168.1.5 }
+        k8s-server-03: { ansible_host: 192.168.1.2 }
+        k8s-worker-01: { ansible_host: 192.168.1.3 }
+  vars:
+    ansible_user: root
+    ansible_python_interpreter: /usr/bin/python3