Add DI support for RecDbContext with configuration options

Introduced a `DependencyInjection` class with an extension
method `AddInfrastructureServices` to register `RecDbContext`
using configurable `DbContextOptions`. Added a `ConfigurationOptions`
class to encapsulate `DbContext` configuration.

Validated that `DbContextOptionsAction` is provided before
registration. Updated `ReC.Infrastructure.csproj` to include
`Microsoft.Extensions.Configuration.Abstractions` for enhanced
configuration support. Added necessary `using` directives.

src/ReC.Infrastructure/DependencyInjection.cs

@@ -0,0 +1,31 @@
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace ReC.Infrastructure;
+
+public static class DependencyInjection
+{
+    public static IServiceCollection AddInfrastructureServices(this IServiceCollection services, Action<ConfigurationOptions> options)
+    {
+        var configOpt = new ConfigurationOptions();
+        options.Invoke(configOpt);
+        
+        if(configOpt.DbContextOptionsAction is null)
+            throw new InvalidOperationException("DbContextOptionsAction must be configured.");
+
+        services.AddDbContext<RecDbContext>(configOpt.DbContextOptionsAction);
+        
+        return services;
+    }
+
+    public class ConfigurationOptions
+    {
+        internal Action<DbContextOptionsBuilder>? DbContextOptionsAction { get; private set; }
+
+        public ConfigurationOptions ConfigureDbContext(Action<DbContextOptionsBuilder> optionsAction)
+        {
+            DbContextOptionsAction = optionsAction;
+            return this;
+        }
+    }
+}

src/ReC.Infrastructure/ReC.Infrastructure.csproj

@@ -8,6 +8,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.EntityFrameworkCore" Version="9.0.11" />
+    <PackageReference Include="Microsoft.Extensions.Configuration.Abstractions" Version="10.0.0" />
   </ItemGroup>
 
   <ItemGroup>