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

src/ZB.MOM.WW.ScadaBridge.SiteRuntime/ServiceCollectionExtensions.cs

@@ -70,7 +70,11 @@ public static class ServiceCollectionExtensions
         // reconciliation, Tracking.Status audit-only). Central roots never call
         // AddSiteRuntime, so this stays absent on central — matching the SITE-ONLY
         // contract. OperationTrackingOptions is bound + validated by the Host's
-        // SiteServiceRegistration site-options block.
+        // SiteServiceRegistration site-options block — but it no longer supplies the
+        // store's database: the store takes ILocalDb (the consolidated site database
+        // at LocalDb:Path), so OperationTrackingOptions.ConnectionString is now only
+        // read by the site config DB. Resolving this store therefore forces ILocalDb
+        // construction, which is what runs SiteLocalDbSetup.OnReady.
         services.AddSingleton<Commons.Interfaces.IOperationTrackingStore, Tracking.OperationTrackingStore>();
 
         // Site-local repository implementations backed by SQLite