feat(infrastructure): add EF Core context and repository implementations

src/infrastructure/DigitalData.TaskFlow.Infrastructure/DependencyInjection.cs

@@ -1,4 +1,8 @@
-using Microsoft.Extensions.Configuration;
+using DigitalData.TaskFlow.Application.Common.Interfaces;
+using DigitalData.TaskFlow.Infrastructure.Persistence;
+using DigitalData.TaskFlow.Infrastructure.Repositories;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
 
 namespace DigitalData.TaskFlow.Infrastructure;
@@ -7,6 +11,21 @@ public static class DependencyInjection
 {
     public static IServiceCollection AddInfrastructureServices(this IServiceCollection services, IConfiguration configuration)
     {
+        var connectionString = configuration.GetConnectionString("TaskFlowDb");
+
+        if (string.IsNullOrWhiteSpace(connectionString))
+        {
+            throw new InvalidOperationException("Connection string 'TaskFlowDb' is not configured.");
+        }
+
+        services.AddDbContext<TaskFlowDbContext>(options =>
+        {
+            options.UseSqlServer(connectionString);
+        });
+
+        services.AddScoped<IWorkflowRepository, WorkflowRepository>();
+        services.AddScoped<IDocumentRepository, DocumentRepository>();
+
         return services;
     }
 }