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.ConfigurationDatabase/Services/InstanceLocator.cs

@@ -0,0 +1,36 @@
+using Microsoft.EntityFrameworkCore;
+using ZB.MOM.WW.ScadaBridge.Commons.Interfaces.Services;
+
+namespace ZB.MOM.WW.ScadaBridge.ConfigurationDatabase.Services;
+
+/// <summary>
+/// Resolves instance unique names to site identifiers using the configuration database.
+/// </summary>
+public class InstanceLocator : IInstanceLocator
+{
+    private readonly ScadaBridgeDbContext _context;
+
+    /// <summary>Initializes the locator with the EF Core database context.</summary>
+    /// <param name="context">The database context used to look up instances and sites.</param>
+    public InstanceLocator(ScadaBridgeDbContext context)
+    {
+        _context = context ?? throw new ArgumentNullException(nameof(context));
+    }
+
+    /// <inheritdoc />
+    public async Task<string?> GetSiteIdForInstanceAsync(
+        string instanceUniqueName,
+        CancellationToken cancellationToken = default)
+    {
+        var instance = await _context.Set<Commons.Entities.Instances.Instance>()
+            .FirstOrDefaultAsync(i => i.UniqueName == instanceUniqueName, cancellationToken);
+
+        if (instance == null)
+            return null;
+
+        var site = await _context.Set<Commons.Entities.Sites.Site>()
+            .FindAsync(new object[] { instance.SiteId }, cancellationToken);
+
+        return site?.SiteIdentifier;
+    }
+}