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/log-observability-elk-grafana/logstash/config/logstash.yml

@@ -0,0 +1,2 @@
+http.host: 0.0.0.0
+pipeline.ecs_compatibility: disabled

professional-infra/log-observability-elk-grafana/logstash/pipeline/logstash.conf

@@ -0,0 +1,24 @@
+input {
+  beats {
+    port => 5044
+  }
+}
+
+filter {
+  grok {
+    match => { "message" => "\[%{TIMESTAMP_ISO8601:observed_at}\] %{LOGLEVEL:level} %{GREEDYDATA:event_message}" }
+    tag_on_failure => ["portfolio_parse_failure"]
+  }
+}
+
+output {
+  elasticsearch {
+    hosts => ["http://elasticsearch:9200"]
+    user => "elastic"
+    password => "elastic"
+    index => "portfolio-logs-%{+YYYY.MM.dd}"
+  }
+  stdout {
+    codec => rubydebug
+  }
+}