feat(data): rename *.Services projects, lift TrackEntity onto BlazorBlocks data layer, regenerate initial Postgres migration

DeepDrftWeb.Services → DeepDrftData; DeepDrftContent.Services → DeepDrftContent.Data.
TrackEntity:BaseEntity, TrackRepository:Repository<>, TrackManager:Manager<>+ITrackService.
Drops DeepDrftModels PagingParameters/PagedResult in favour of Models.Common.* from BlazorBlocks.
InitialCreate migration captures full schema including is_deleted index.

DeepDrftData/ITrackService.cs

@@ -0,0 +1,15 @@
+using DeepDrftModels.Entities;
+using Models.Common;
+using NetBlocks.Models;
+
+namespace DeepDrftData;
+
+public interface ITrackService
+{
+    Task<ResultContainer<TrackEntity?>> GetById(long id);
+    Task<ResultContainer<List<TrackEntity>>> GetAll();
+    Task<ResultContainer<PagedResult<TrackEntity>>> GetPaged(int pageNumber, int pageSize, string? sortColumn, bool sortDescending, CancellationToken cancellationToken = default);
+    Task<ResultContainer<TrackEntity>> Create(TrackEntity newTrack);
+    Task<ResultContainer<TrackEntity>> Update(TrackEntity track);
+    Task<Result> Delete(long id);
+}