V13-FE-011: finalize search list layout slice

docs/Design/kbx-foundation-v36/backend/Shared/Runtime/KbxNotificationRepository.cs

@@ -0,0 +1,31 @@
+using Dapper;
+using Npgsql;
+
+namespace Kbx.Shared.Runtime;
+
+public sealed class KbxNotificationRepository(NpgsqlDataSource dataSource)
+{
+    public async Task<IReadOnlyList<KbxUserNotificationDto>> GetRecentAsync(Guid tenantId, Guid userId, int limit, CancellationToken ct)
+    {
+        const string sql = """
+        select id, severity, title, message, created_at as CreatedAt, read_at as ReadAt,
+               screen_id as ScreenId, entity_type as EntityType, entity_id as EntityId,
+               action::text as ActionJson
+        from kbx.user_notifications
+        where tenant_id=@tenantId and user_id=@userId
+          and (expires_at is null or expires_at > now())
+        order by created_at desc
+        limit @limit;
+        """;
+        await using var connection = await dataSource.OpenConnectionAsync(ct);
+        var rows = await connection.QueryAsync<KbxUserNotificationDto>(new CommandDefinition(sql, new { tenantId, userId, limit = Math.Clamp(limit, 1, 100) }, cancellationToken: ct));
+        return rows.AsList();
+    }
+
+    public async Task MarkReadAsync(Guid tenantId, Guid userId, Guid id, CancellationToken ct)
+    {
+        const string sql = "update kbx.user_notifications set read_at=coalesce(read_at, now()) where tenant_id=@tenantId and user_id=@userId and id=@id";
+        await using var connection = await dataSource.OpenConnectionAsync(ct);
+        await connection.ExecuteAsync(new CommandDefinition(sql, new { tenantId, userId, id }, cancellationToken: ct));
+    }
+}