Initial CV-aligned infrastructure portfolio

Rework portfolio around Linux operations, Zabbix monitoring, migration validation, and ELK/Grafana log observability.

Add AAP-style LVM resize workflow, Zabbix server/proxy/agent automation assets, Linux/AIX monitoring templates, and updated validation CI.

professional-infra/zabbix-monitoring-incident-response/roles/zabbix_proxy/tasks/main.yml

@@ -0,0 +1,31 @@
+---
+- name: Validate proxy mode
+  ansible.builtin.assert:
+    that:
+      - zabbix_proxy_mode in ["active", "passive"]
+    fail_msg: "zabbix_proxy_mode must be active or passive"
+
+- name: Create Zabbix proxy config directory
+  ansible.builtin.file:
+    path: /etc/zabbix
+    state: directory
+    owner: root
+    group: root
+    mode: "0755"
+
+- name: Render Zabbix proxy configuration example
+  ansible.builtin.template:
+    src: zabbix_proxy.conf.j2
+    dest: /etc/zabbix/zabbix_proxy.conf
+    owner: root
+    group: root
+    mode: "0644"
+
+- name: Report proxy operating model
+  ansible.builtin.debug:
+    msg:
+      proxy: "{{ zabbix_proxy_hostname }}"
+      server: "{{ zabbix_proxy_server }}"
+      mode: "{{ zabbix_proxy_mode }}"
+      active_checks: "{{ zabbix_proxy_mode == 'active' }}"
+      offline_buffer_hours: "{{ zabbix_proxy_offline_buffer_hours }}"