feat: expand cockpit integrations and support workflows

Add Phoenix remote desktop, action connector, documentation engine, and gamification support. Refactor support-case processing and search/action UI, and update installer assets and dependencies.

F4SD-ActionConnector/Payloads/CaseClosedPayload.cs

@@ -0,0 +1,17 @@
+using System;
+using F4SD.ActionConnector.Enumerations;
+
+namespace F4SD.ActionConnector.Payloads
+{
+    public sealed class CaseClosedPayload : PayloadBase
+    {
+        public override TriggerEvent Event => TriggerEvent.CaseClosed;
+
+        public string Id { get; set; }
+        public string Subject { get; set; }
+        public string Priority { get; set; }
+        public Guid UserId { get; set; }
+        public string ClosedByUserName { get; set; }
+        public DateTime ClosedAt { get; set; }
+    }
+}