Remove DispatchR and use Mediator

Application/PlayLists/Handlers/CreatePlayListCommandHandler.cs

@@ -1,5 +1,5 @@
 using Ardalis.Result;
-using DispatchR.Abstractions.Send;
+using Mediator;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Logging;
 using Musify.Application.Configuration;
@@ -14,9 +14,9 @@ namespace Musify.Application.PlayLists.Handlers
 {
     public class CreatePlayListCommandHandler(IEventBus eventBus, IDatabase database, IStorageService storageHandler,
         ILogger<CreatePlayListCommandHandler> logger, ApplicationStorageConfiguration storageConfiguration, PlayListConfiguration playListConfiguration)
-        : IRequestHandler<CreatePlayListCommand, Task<Result<PlayListResponse>> >
+        : ICommandHandler<CreatePlayListCommand, Result<PlayListResponse>> 
     {
-        public async Task<Result<PlayListResponse>> Handle(CreatePlayListCommand request, CancellationToken cancellationToken)
+        public async ValueTask<Result<PlayListResponse>> Handle(CreatePlayListCommand request, CancellationToken cancellationToken)
         {
             var userExists = await database.Users.AnyAsync(u => u.Id == request.UserId, cancellationToken);
             if (!userExists)

Application/PlayLists/Handlers/DeletePlayListCommandHandler.cs

@@ -1,5 +1,5 @@
 using Ardalis.Result;
-using DispatchR.Abstractions.Send;
+using Mediator;
 using Microsoft.Extensions.Logging;
 using Musify.Application.Configuration;
 using Musify.Application.Contracts.Infrastructure;
@@ -10,9 +10,9 @@ namespace Musify.Application.PlayLists.Handlers
 {
     public class DeletePlayListCommandHandler(IDatabase database, IEventBus eventBus,
         ApplicationStorageConfiguration storageConfiguration, PlayListConfiguration playListConfiguration, ILogger<DeletePlayListCommandHandler> logger)
-        : IRequestHandler<DeletePlayListCommand, Task<Result>>
+        : ICommandHandler<DeletePlayListCommand, Result>
     {
-        public async Task<Result> Handle(DeletePlayListCommand request, CancellationToken cancellationToken)
+        public async ValueTask<Result> Handle(DeletePlayListCommand request, CancellationToken cancellationToken)
         {
             var playList = await database.PlayLists.FindAsync(
                 [request.PlayListId],

Application/PlayLists/Handlers/GetPlayListByIdQueryHandler.cs

@@ -1,16 +1,16 @@
 using Ardalis.Result;
-using DispatchR.Abstractions.Send;
 using Microsoft.EntityFrameworkCore;
 using Musify.Application.Contracts.Infrastructure;
 using Musify.Application.PlayLists.Responses;
 using Musify.Application.PlayLists.Queries;
+using Mediator;
 
 namespace Musify.Application.PlayLists.Handlers
 {
     public class GetPlayListByIdQueryHandler(IDatabase database)
-        : IRequestHandler<GetPlayListByIdQuery, Task<Result<PlayListResponse>> >
+        : IQueryHandler<GetPlayListByIdQuery, Result<PlayListResponse>>
     {
-        public async Task<Result<PlayListResponse>> Handle(GetPlayListByIdQuery request, CancellationToken cancellationToken)
+        public async ValueTask<Result<PlayListResponse>> Handle(GetPlayListByIdQuery request, CancellationToken cancellationToken)
         {
             var playList = await database.PlayLists
                 .AsNoTracking()

Application/PlayLists/Handlers/GetPlayListsByUserIdQueryHandler.cs

@@ -1,18 +1,18 @@
 using Ardalis.Result;
-using DispatchR.Abstractions.Send;
 using Microsoft.EntityFrameworkCore;
 using Musify.Application.Contracts.Application;
 using Musify.Application.Contracts.Infrastructure;
 using Musify.Application.PlayLists.Responses;
 using Musify.Application.PlayLists.Queries;
 using X.PagedList.EF;
+using Mediator;
 
 namespace Musify.Application.PlayLists.Handlers
 {
     public class GetPlayListsByUserIdQueryHandler(IDatabase database)
-        : IRequestHandler<GetPlayListsByUserIdQuery, Task<Result<PaginatedResponse<PlayListResponse> > >>
+        : IQueryHandler<GetPlayListsByUserIdQuery, Result<PaginatedResponse<PlayListResponse> > >
     {
-        public async Task<Result<PaginatedResponse<PlayListResponse> >> Handle(GetPlayListsByUserIdQuery request, CancellationToken cancellationToken)
+        public async ValueTask<Result<PaginatedResponse<PlayListResponse> >> Handle(GetPlayListsByUserIdQuery request, CancellationToken cancellationToken)
         {
             var pageNumber = request.PageNumber < 1 ? 1 : request.PageNumber;
             var pageSize = request.PageSize < 1 ? 10 : request.PageSize;

Application/PlayLists/Handlers/GetPlayListsQueryHandler.cs

@@ -1,18 +1,18 @@
 using Ardalis.Result;
-using DispatchR.Abstractions.Send;
 using Microsoft.EntityFrameworkCore;
 using Musify.Application.Contracts.Application;
 using Musify.Application.Contracts.Infrastructure;
 using Musify.Application.PlayLists.Responses;
 using Musify.Application.PlayLists.Queries;
 using X.PagedList.EF;
+using Mediator;
 
 namespace Musify.Application.PlayLists.Handlers
 {
     public class GetPlayListsQueryHandler(IDatabase database)
-        : IRequestHandler<GetPlayListsQuery, Task<Result<PaginatedResponse<PlayListResponse> >> >
+        : IQueryHandler<GetPlayListsQuery, Result<PaginatedResponse<PlayListResponse> >>
     {
-        public async Task<Result<PaginatedResponse<PlayListResponse> >> Handle(GetPlayListsQuery request, CancellationToken cancellationToken)
+        public async ValueTask<Result<PaginatedResponse<PlayListResponse> >> Handle(GetPlayListsQuery request, CancellationToken cancellationToken)
         {
             var pageNumber = request.PageNumber < 1 ? 1 : request.PageNumber;
             var pageSize = request.PageSize < 1 ? 10 : request.PageSize;

Application/PlayLists/Handlers/UpdatePlayListCommandHandler.cs

@@ -1,5 +1,5 @@
 using Ardalis.Result;
-using DispatchR.Abstractions.Send;
+using Mediator;
 using Microsoft.Extensions.Logging;
 using Musify.Application.Configuration;
 using Musify.Application.Contracts.Application;
@@ -14,9 +14,9 @@ namespace Musify.Application.PlayLists.Handlers
     public class UpdatePlayListCommandHandler(IEventBus eventBus, IDatabase database, IStorageService storageHandler,
         ILogger<UpdatePlayListCommandHandler> logger, ApplicationStorageConfiguration storageConfiguration,
         PlayListConfiguration playListConfiguration)
-        : IRequestHandler<UpdatePlayListCommand, Task<Result<PlayListResponse>> >
+        : ICommandHandler<UpdatePlayListCommand, Result<PlayListResponse>>
     {
-        public async Task<Result<PlayListResponse>> Handle(UpdatePlayListCommand request, CancellationToken cancellationToken)
+        public async ValueTask<Result<PlayListResponse>> Handle(UpdatePlayListCommand request, CancellationToken cancellationToken)
         {
             var playListEntity = await database.PlayLists.FindAsync(
                 [request.PlayListId],