Add MediatR, FluentValidation, AutoMapper, and EF Core

Updated application and infrastructure layers to include MediatR, FluentValidation, AutoMapper, and Entity Framework Core.

- Added new dependencies to `DigitalData.TaskFlow.Application.csproj` and `DigitalData.TaskFlow.Infrastructure.csproj` for MediatR, FluentValidation, AutoMapper, and EF Core.
- Configured MediatR with options and license key support.
- Registered validators and AutoMapper profiles in the application layer.
- Introduced `MediatROptions` and `SwaggerOptions` for configuration.
- Updated `appsettings.json` with connection strings and configuration sections for MediatR and Swagger.
- Replaced placeholder comments in `DependencyInjection` classes with actual service registrations.
- Upgraded `Swashbuckle.AspNetCore` and added `FluentValidation.AspNetCore` for API validation.

src/presentation/DigitalData.TaskFlow.API/DigitalData.TaskFlow.API.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk.Web">
+<Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
     <TargetFramework>net8.0</TargetFramework>
@@ -7,7 +7,8 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Swashbuckle.AspNetCore" Version="6.6.2" />
+    <PackageReference Include="FluentValidation.AspNetCore" Version="11.3.1" />
+    <PackageReference Include="Swashbuckle.AspNetCore" Version="10.3.0" />
   </ItemGroup>
 
   <ItemGroup>

src/presentation/DigitalData.TaskFlow.API/Options/SwaggerOptions.cs

@@ -0,0 +1,8 @@
+namespace DigitalData.TaskFlow.API.Options;
+
+public sealed class SwaggerOptions
+{
+    public const string SectionName = "Swagger";
+
+    public bool EnabledInProduction { get; init; }
+}

src/presentation/DigitalData.TaskFlow.API/appsettings.json

@@ -1,4 +1,13 @@
 {
+  "ConnectionStrings": {
+    "TaskFlowDb": "Server=SDD-VHP04-SQL19\\DD_TESTING01;Database=DD_ECM;User Id=sa;Password=123456789dD!;Encrypt=false;TrustServerCertificate=True;"
+  },
+  "MediatR": {
+    "LuckyPennySoftLicenseKey": "eyJhbGciOiJSUzI1NiIsImtpZCI6Ikx1Y2t5UGVubnlTb2Z0d2FyZUxpY2Vuc2VLZXkvYmJiMTNhY2I1OTkwNGQ4OWI0Y2IxYzg1ZjA4OGNjZjkiLCJ0eXAiOiJKV1QifQ.eyJpc3MiOiJodHRwczovL2x1Y2t5cGVubnlzb2Z0d2FyZS5jb20iLCJhdWQiOiJMdWNreVBlbm55U29mdHdhcmUiLCJleHAiOiIxODE2MTI4MDAwIiwiaWF0IjoiMTc4NDYyNDU1NyIsImFjY291bnRfaWQiOiIwMTk4M2M1OWU0YjM3MjhlYmZkMzEwM2MyYTQ4NmU4NSIsImN1c3RvbWVyX2lkIjoiMDE5ODNjNTllNGIzNzI4ZWJmZDMxMDNjMmE0ODZlODUiLCJzdWJfaWQiOiItIiwiZWRpdGlvbiI6IjAiLCJ0eXBlIjoiMiJ9.IUUO926m9crYGYxMjjKD_n9BnUm-EDyjFIn0YmMUCo7C-QTwvB8WhXP8veTSFsBq-leIIDJ4jyl7Pgc_7ciwg1XhUSIs4mkQroEUaSFCGOxw7Pi41WM8MK5YFSaqLTYYXec9zxgiJbGzABbh3CHTSup3okGnVm_CMoPEs91l2c0A6N1JyZy74urd_tF0KGVKf0MOvzdlQIWLQ8o73S4pTv2N-F6UlzI0fdMtTHMLNNQyr0NdWdnuBk_jMBXO-gy5RE_oCRfMTTYRX2n3XLK6pTfXE0Ct338o9F5sH8Ph2lTXSu56cpdsfZOQZGqCH0LoFp1Dd7RJgIgNmBiTGfvDnA"
+  },
+  "Swagger": {
+    "EnabledInProduction": false
+  },
   "Logging": {
     "LogLevel": {
       "Default": "Information",