refactor: scrub residual ScadaLink refs → ScadaBridge (env vars, config keys, assembly name, SQL login)

Renames the 13 SCADALINK_* runtime env vars → SCADABRIDGE_*, the ScadaLink__
.NET config keys → ScadaBridge__, the stale ScadaLink.Host.exe assembly name
→ ZB.MOM.WW.ScadaBridge.Host.exe, the scadalink_app SQL login → scadabridge_app,
and residual identifiers/comments/docs. Migration records (prior rename
tooling/design, DB-rename helper, this scrub script) carved out.

Adds tools/scrub-scadalink-refs.sh.

src/ZB.MOM.WW.ScadaBridge.Transport/Export/BundleExporter.cs

@@ -115,7 +115,7 @@ public sealed class BundleExporter : IBundleExporter
         var templateManifest = _manifestBuilder.Build(
             sourceEnvironment: sourceEnvironment,
             exportedBy: user,
-            scadaLinkVersion: assemblyVersion,
+            scadaBridgeVersion: assemblyVersion,
             encryption: encryptionSeed,
             summary: summary,
             contents: resolved.ContentManifest,

src/ZB.MOM.WW.ScadaBridge.Transport/Serialization/ManifestBuilder.cs

@@ -20,7 +20,7 @@ public sealed class ManifestBuilder
     /// </summary>
     /// <param name="sourceEnvironment">Environment label identifying where the bundle was exported from.</param>
     /// <param name="exportedBy">Username of the operator who performed the export.</param>
-    /// <param name="scadaLinkVersion">ScadaBridge version string stamped in the manifest.</param>
+    /// <param name="scadaBridgeVersion">ScadaBridge version string stamped in the manifest.</param>
     /// <param name="encryption">Encryption metadata when the content is encrypted; null for plain bundles.</param>
     /// <param name="summary">High-level summary of artifact counts.</param>
     /// <param name="contents">Per-entry content table describing each artifact in the bundle.</param>
@@ -29,7 +29,7 @@ public sealed class ManifestBuilder
     public BundleManifest Build(
         string sourceEnvironment,
         string exportedBy,
-        string scadaLinkVersion,
+        string scadaBridgeVersion,
         EncryptionMetadata? encryption,
         BundleSummary summary,
         IReadOnlyList<ManifestContentEntry> contents,
@@ -37,7 +37,7 @@ public sealed class ManifestBuilder
     {
         ArgumentNullException.ThrowIfNull(sourceEnvironment);
         ArgumentNullException.ThrowIfNull(exportedBy);
-        ArgumentNullException.ThrowIfNull(scadaLinkVersion);
+        ArgumentNullException.ThrowIfNull(scadaBridgeVersion);
         ArgumentNullException.ThrowIfNull(summary);
         ArgumentNullException.ThrowIfNull(contents);
         ArgumentNullException.ThrowIfNull(contentBytes);
@@ -50,7 +50,7 @@ public sealed class ManifestBuilder
             CreatedAtUtc: DateTimeOffset.UtcNow,
             SourceEnvironment: sourceEnvironment,
             ExportedBy: exportedBy,
-            ScadaBridgeVersion: scadaLinkVersion,
+            ScadaBridgeVersion: scadaBridgeVersion,
             ContentHash: contentHash,
             Encryption: encryption,
             Summary: summary,