feat: achieve CLI parity with Central UI

Add 33 new management message records, ManagementActor handlers, and CLI
commands to close all functionality gaps between the Central UI and the
Management CLI. New capabilities include:

- Template member CRUD (attributes, alarms, scripts, compositions)
- Shared script CRUD
- Database connection definition CRUD
- Inbound API method CRUD
- LDAP scope rule management
- API key enable/disable
- Area update
- Remote event log and parked message queries
- Missing get/update commands for templates, sites, instances, data
  connections, external systems, notifications, and SMTP config

Includes 12 new ManagementActor unit tests covering authorization,
happy-path queries, and error handling. Updates CLI README and component
design documents (Component-CLI.md, Component-ManagementService.md).

src/ScadaLink.CLI/Commands/InstanceCommands.cs

@@ -11,7 +11,9 @@ public static class InstanceCommands
         var command = new Command("instance") { Description = "Manage instances" };
 
         command.Add(BuildList(contactPointsOption, formatOption));
+        command.Add(BuildGet(contactPointsOption, formatOption));
         command.Add(BuildCreate(contactPointsOption, formatOption));
+        command.Add(BuildSetBindings(contactPointsOption, formatOption));
         command.Add(BuildDeploy(contactPointsOption, formatOption));
         command.Add(BuildEnable(contactPointsOption, formatOption));
         command.Add(BuildDisable(contactPointsOption, formatOption));
@@ -20,6 +22,43 @@ public static class InstanceCommands
         return command;
     }
 
+    private static Command BuildGet(Option<string> contactPointsOption, Option<string> formatOption)
+    {
+        var idOption = new Option<int>("--id") { Description = "Instance ID", Required = true };
+        var cmd = new Command("get") { Description = "Get an instance by ID" };
+        cmd.Add(idOption);
+        cmd.SetAction(async (ParseResult result) =>
+        {
+            var id = result.GetValue(idOption);
+            return await CommandHelpers.ExecuteCommandAsync(
+                result, contactPointsOption, formatOption, new GetInstanceCommand(id));
+        });
+        return cmd;
+    }
+
+    private static Command BuildSetBindings(Option<string> contactPointsOption, Option<string> formatOption)
+    {
+        var idOption = new Option<int>("--id") { Description = "Instance ID", Required = true };
+        var bindingsOption = new Option<string>("--bindings") { Description = "JSON array of [attributeName, dataConnectionId] pairs", Required = true };
+
+        var cmd = new Command("set-bindings") { Description = "Set data connection bindings for an instance" };
+        cmd.Add(idOption);
+        cmd.Add(bindingsOption);
+        cmd.SetAction(async (ParseResult result) =>
+        {
+            var id = result.GetValue(idOption);
+            var bindingsJson = result.GetValue(bindingsOption)!;
+            var pairs = System.Text.Json.JsonSerializer.Deserialize<List<List<object>>>(bindingsJson)
+                ?? throw new InvalidOperationException("Invalid bindings JSON");
+            var bindings = pairs.Select(p =>
+                (p[0].ToString()!, int.Parse(p[1].ToString()!))).ToList();
+            return await CommandHelpers.ExecuteCommandAsync(
+                result, contactPointsOption, formatOption,
+                new SetConnectionBindingsCommand(id, bindings));
+        });
+        return cmd;
+    }
+
     private static Command BuildList(Option<string> contactPointsOption, Option<string> formatOption)
     {
         var siteIdOption = new Option<int?>("--site-id") { Description = "Filter by site ID" };