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.NotificationService/SmtpPermanentException.cs

@@ -0,0 +1,15 @@
+namespace ZB.MOM.WW.ScadaBridge.NotificationService;
+
+/// <summary>
+/// Signals a permanent SMTP failure (5xx) that should not be retried.
+/// </summary>
+public class SmtpPermanentException : Exception
+{
+    /// <summary>
+    /// Initializes the exception with a message and optional inner exception.
+    /// </summary>
+    /// <param name="message">Message describing the permanent SMTP failure.</param>
+    /// <param name="innerException">Optional inner exception from the SMTP client.</param>
+    public SmtpPermanentException(string message, Exception? innerException = null)
+        : base(message, innerException) { }
+}