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.

tests/ZB.MOM.WW.ScadaBridge.CentralUI.PlaywrightTests/SiteCalls/SiteCallDataSeeder.cs

@@ -28,11 +28,11 @@ internal static class SiteCallDataSeeder
     private const string DefaultConnectionString =
         "Server=localhost,1433;Database=ScadaBridgeConfig;User Id=scadabridge_app;Password=ScadaBridge_Dev1#;TrustServerCertificate=true;Encrypt=false;Connect Timeout=5";
 
-    private const string EnvVar = "SCADALINK_PLAYWRIGHT_DB";
+    private const string EnvVar = "SCADABRIDGE_PLAYWRIGHT_DB";
 
     /// <summary>
     /// Connection string for the running cluster's configuration DB. Resolved
-    /// from <c>SCADALINK_PLAYWRIGHT_DB</c> when set, otherwise the local docker
+    /// from <c>SCADABRIDGE_PLAYWRIGHT_DB</c> when set, otherwise the local docker
     /// dev defaults.
     /// </summary>
     public static string ConnectionString

tests/ZB.MOM.WW.ScadaBridge.CentralUI.PlaywrightTests/SiteCalls/SiteCallsPageTests.cs

@@ -101,7 +101,7 @@ public class SiteCallsPageTests
     /// <summary>Skip reason shared by the DB-seeding tests when MSSQL is down.</summary>
     private const string DbUnavailableSkipReason =
         "SiteCallDataSeeder cannot reach MSSQL at localhost:1433 — bring up infra/docker-compose and docker/deploy.sh, " +
-        "or set SCADALINK_PLAYWRIGHT_DB to a reachable connection string.";
+        "or set SCADABRIDGE_PLAYWRIGHT_DB to a reachable connection string.";
 
     [SkippableFact]
     public async Task FilterNarrowing_ChannelFilterShrinksGrid()