feat(localdb): gRPC sync adapters, background service, replication DI

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

ZB.MOM.WW.LocalDb/src/ZB.MOM.WW.LocalDb.Replication/Internal/SyncSessionFactory.cs

@@ -0,0 +1,20 @@
+using Microsoft.Extensions.Logging;
+using ZB.MOM.WW.LocalDb.Internal;
+
+namespace ZB.MOM.WW.LocalDb.Replication.Internal;
+
+/// <summary>
+/// Shared construction of a <see cref="SyncSession"/> and its dependencies (OplogStore + LwwApplier)
+/// from a <see cref="SqliteLocalDb"/> and the bound options. Both the service and client adapters use
+/// this so they build an identical session; snapshot hooks are left null (Task 12 fills them in).
+/// </summary>
+internal static class SyncSessionFactory
+{
+    public static SyncSession Create(SqliteLocalDb db, ReplicationOptions options, ILoggerFactory loggerFactory)
+    {
+        var store = new OplogStore(db, options);
+        var applier = new LwwApplier(db);
+        var logger = loggerFactory.CreateLogger<SyncSession>();
+        return new SyncSession(db, store, applier, options, logger);
+    }
+}