refactor: rename ScadaLink → ZB.MOM.WW.ScadaBridge (code + projects + namespaces)

Solution + 23 src projects + 26 test projects renamed; folders, csproj,
namespaces, and ScadaLinkDbContext/ScadaBridgeDbContext class updated.
ActorSystem "scadalink" → "scadabridge", Akka seed-node URLs migrated.
SQL roles/logins, LDAP domains, CLI command name, and CLI config dir
(~/.scadalink → ~/.scadabridge) also renamed.

Build green; 5 Host.Tests fail awaiting SQL login rename in next commit.
Pre-existing StaleTagMonitor timing flakes unchanged.

Rename script committed at tools/rename-to-scadabridge.sh.

src/ZB.MOM.WW.ScadaBridge.Commons/Messages/Instance/GetAttributeRequest.cs

@@ -0,0 +1,25 @@
+namespace ZB.MOM.WW.ScadaBridge.Commons.Messages.Instance;
+
+/// <summary>
+/// Request to get the current value of an attribute from an Instance Actor.
+/// Uses the Ask pattern for system boundaries; Tell pattern is preferred for hot-path.
+/// </summary>
+public record GetAttributeRequest(
+    string CorrelationId,
+    string InstanceUniqueName,
+    string AttributeName,
+    DateTimeOffset Timestamp);
+
+/// <summary>
+/// Response containing the current value and quality of an attribute.
+/// Quality is "Good", "Bad", or "Uncertain".
+/// Data-sourced attributes start at "Uncertain" until the first DCL value update arrives.
+/// </summary>
+public record GetAttributeResponse(
+    string CorrelationId,
+    string InstanceUniqueName,
+    string AttributeName,
+    object? Value,
+    bool Found,
+    string Quality,
+    DateTimeOffset Timestamp);