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

Completes Task 5a of the LocalDb Phase 1 adoption plan. The GUID-id half landed
with Task 2 (727fa48c) because leaving it out would have committed a writer that
could not satisfy site_events.id NOT NULL; this is the connection half, which
was blocked on Task 3.

SiteEventLogger owned a SqliteConnection built from SiteEventLogOptions
.DatabasePath. It now takes ILocalDb and gets that connection from
CreateConnection() - already open, pragma-configured, and carrying the
zb_hlc_next() UDF that site_events' capture triggers call. It still owns and
disposes the connection; WithConnection's signature and locking semantics are
untouched, so EventLogQueryService and EventLogPurgeService are unaffected.

The connectionStringOverride seam is deleted rather than preserved. site_events
is a replicated table, so a raw connection lacks the UDF and fails closed on
every insert - an override could only produce a logger that cannot write. It had
no callers outside this class (the connectionStringOverride hits elsewhere in the
tree belong to SqliteAuditWriter, a different type).

Tests: a shared TestLocalDb helper gives each fixture a real ILocalDb over a temp
file. Real rather than stubbed on purpose - a stub handing back a bare
SqliteConnection would pass today and fail closed the moment the table is
registered, which is exactly the silent-wiring failure mode this family has hit
three times. ServiceWiringTests' DI path also needed AddZbLocalDb, mirroring
SiteServiceRegistration.

Verified: build 0 warnings; SiteEventLogging 70/70, Host 294/294,
SiteRuntime 530/530.

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

tests/ZB.MOM.WW.ScadaBridge.SiteEventLogging.Tests/ServiceWiringTests.cs

@@ -1,6 +1,8 @@
+using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
+using ZB.MOM.WW.LocalDb;
 
 namespace ZB.MOM.WW.ScadaBridge.SiteEventLogging.Tests;
 
@@ -23,7 +25,7 @@ public class ServiceWiringTests : IDisposable
     public void Dispose()
     {
         _provider?.Dispose();
-        if (File.Exists(_dbPath)) File.Delete(_dbPath);
+        TestLocalDb.DeleteFiles(_dbPath);
     }
 
     [Fact]
@@ -32,6 +34,15 @@ public class ServiceWiringTests : IDisposable
         var services = new ServiceCollection();
         services.AddLogging();
         services.Configure<SiteEventLogOptions>(o => o.DatabasePath = _dbPath);
+        // SiteEventLogger now takes ILocalDb, so the consolidated site database has to
+        // be in the graph for AddSiteEventLogging to resolve at all. In the host this
+        // comes from SiteServiceRegistration's AddZbLocalDb.
+        services.AddZbLocalDb(new ConfigurationBuilder()
+            .AddInMemoryCollection(new Dictionary<string, string?>
+            {
+                ["LocalDb:Path"] = _dbPath,
+            })
+            .Build());
         services.AddSiteEventLogging();
 
         _provider = services.BuildServiceProvider();
@@ -57,8 +68,9 @@ public class ServiceWiringTests : IDisposable
         // concrete SiteEventLogger. Constructing them directly must compile and work.
         var options = Options.Create(new SiteEventLogOptions { DatabasePath = _dbPath });
         using var loggerFactory = LoggerFactory.Create(_ => { });
+        using var localDb = TestLocalDb.Create(_dbPath);
         using var recorder = new SiteEventLogger(
-            options, loggerFactory.CreateLogger<SiteEventLogger>());
+            options, loggerFactory.CreateLogger<SiteEventLogger>(), localDb.Db);
 
         var purge = new EventLogPurgeService(
             recorder, options, loggerFactory.CreateLogger<EventLogPurgeService>());