feat(localdb): rewire OperationTrackingStore onto the consolidated site database

Task 4 of the LocalDb Phase 1 adoption plan.

OperationTrackingStore took IOptions<OperationTrackingOptions> and opened its own
SqliteConnection from ConnectionString. It now takes ILocalDb and gets every
connection - writer and the two ad-hoc reader paths - from CreateConnection().

This is not cosmetic. OperationTracking is a RegisterReplicated table, so its
capture triggers call zb_hlc_next(). That UDF is registered per connection by
ILocalDb and by nothing else, so a raw SqliteConnection would fail closed on
every write. Connections from CreateConnection() also arrive already open -
calling Open()/OpenAsync() on one throws - hence the removed OpenAsync calls on
the reader paths.

OperationTrackingOptions.ConnectionString is now vestigial for this store; the
database location is LocalDb:Path. The options class stays (retention settings)
and the config key stays bound for the site config DB.

InitializeSchema is kept but is now always a no-op in the host: onReady runs
while ILocalDb is being constructed, strictly before this constructor can
receive it. It remains so a directly-constructed store (tests, tooling) is
self-sufficient.

Tests: the store fixture moves off mode=memory&cache=shared onto a real ILocalDb
over a temp file. There is no in-memory mode - LocalDbOptions.Path is a
filesystem path - and testing through a raw in-memory connection would no longer
resemble the host. Verifier connections stay raw on purpose: this fixture never
registers the table, so no trigger fires and the UDF is never reached.

Three DI fixtures needed LocalDb:Path added, because resolving
IOperationTrackingStore now forces ILocalDb construction:
SiteCompositionRootTests, SiteAuditWiringTests, and the AuditLog
CombinedTelemetryHarness.

Verified: build 0 warnings; Host 294/294, SiteRuntime 530/530, AuditLog 354/354.

Claude-Session: https://claude.ai/code/session_01BL2Vu1ESDQ9SCN4gVKkdts

tests/ZB.MOM.WW.ScadaBridge.Host.Tests/AkkaHostedServiceAuditWiringTests.cs

@@ -290,10 +290,12 @@ public class SiteAuditWiringTests : IDisposable
 {
     private readonly WebApplication _host;
     private readonly string _tempDbPath;
+    private readonly string _tempLocalDbPath;
 
     public SiteAuditWiringTests()
     {
         _tempDbPath = Path.Combine(Path.GetTempPath(), $"scadabridge_audit_wiring_{Guid.NewGuid()}.db");
+        _tempLocalDbPath = Path.Combine(Path.GetTempPath(), $"scadabridge_audit_wiring_localdb_{Guid.NewGuid()}.db");
 
         var builder = WebApplication.CreateBuilder();
         builder.Configuration.Sources.Clear();
@@ -312,6 +314,11 @@ public class SiteAuditWiringTests : IDisposable
             // resolved; point it at an in-memory connection so the test doesn't
             // pollute the working directory.
             ["AuditLog:SiteWriter:DatabasePath"] = ":memory:",
+            // The cached-call telemetry forwarder pulls in IOperationTrackingStore,
+            // which now resolves ILocalDb — so the consolidated site database must be
+            // configured or the whole graph fails to resolve. There is no in-memory
+            // mode: LocalDbOptions.Path is a filesystem path.
+            ["LocalDb:Path"] = _tempLocalDbPath,
         });
 
         builder.Services.AddGrpc();
@@ -326,6 +333,7 @@ public class SiteAuditWiringTests : IDisposable
     {
         (_host as IDisposable)?.Dispose();
         try { File.Delete(_tempDbPath); } catch { /* best effort */ }
+        try { File.Delete(_tempLocalDbPath); } catch { /* best effort */ }
     }
 
     [Fact]