fix(auth.apikeys): stamp schema version 2 to match donor gateway DBs; bump 0.1.2

The store was extracted from MxAccessGateway, whose deployed gateway-auth.db
is at schema_version=2. The library capped at 1 and threw on a newer on-disk
version -> gateway would fail to boot. Final schema is byte-identical since v1;
stamp 2 so existing deployed DBs interoperate (no key re-issuance). +2 tests.

ZB.MOM.WW.Auth/src/ZB.MOM.WW.Auth.ApiKeys/Sqlite/SqliteAuthSchema.cs

@@ -5,8 +5,15 @@ namespace ZB.MOM.WW.Auth.ApiKeys.Sqlite;
 /// </summary>
 public static class SqliteAuthSchema
 {
-    /// <summary>The schema version this build creates and supports.</summary>
-    public const int CurrentVersion = 1;
+    /// <summary>
+    /// The schema version this build creates and supports. This is <c>2</c>, not <c>1</c>,
+    /// to match the deployed databases of the donor (MxAccessGateway) this store was
+    /// extracted from: that store reached its final shape via a v1→v2 history and stamps
+    /// <c>version = 2</c> on disk. The final schema has been byte-identical since v1, so a
+    /// single-shot create stamped as 2 interoperates with existing <c>gateway-auth.db</c>
+    /// files (the migrator only refuses an on-disk version <em>newer</em> than this).
+    /// </summary>
+    public const int CurrentVersion = 2;
 
     /// <summary>Name of the single-row table tracking the applied schema version.</summary>
     public const string SchemaVersionTable = "schema_version";

ZB.MOM.WW.Auth/src/ZB.MOM.WW.Auth.ApiKeys/Sqlite/SqliteAuthStoreMigrator.cs

@@ -35,7 +35,7 @@ public sealed class SqliteAuthStoreMigrator(AuthSqliteConnectionFactory connecti
                 $"Auth database schema version {existingVersion} is newer than supported version {SqliteAuthSchema.CurrentVersion}.");
         }
 
-        await ApplyVersionOneAsync(connection, transaction, cancellationToken).ConfigureAwait(false);
+        await ApplySchemaAsync(connection, transaction, cancellationToken).ConfigureAwait(false);
         await WriteSchemaVersionAsync(connection, transaction, cancellationToken).ConfigureAwait(false);
 
         await transaction.CommitAsync(cancellationToken).ConfigureAwait(false);
@@ -78,7 +78,10 @@ public sealed class SqliteAuthStoreMigrator(AuthSqliteConnectionFactory connecti
             : Convert.ToInt32(version, CultureInfo.InvariantCulture);
     }
 
-    private static async Task ApplyVersionOneAsync(
+    // Single-shot create of the final schema (all DDL is CREATE ... IF NOT EXISTS, so it is
+    // idempotent against an already-provisioned database). The applied version is stamped
+    // separately by WriteSchemaVersionAsync.
+    private static async Task ApplySchemaAsync(
         SqliteConnection connection,
         SqliteTransaction transaction,
         CancellationToken cancellationToken)