feat(infrastructure): implement ISQLExecutor with EF6/EF Core support

- Move ISQLExecutor interface from Application to Domain layer
  - Follow Clean Architecture: Infrastructure references Domain, not Application
  - Namespace: ECMJobRunner.Domain.Interfaces
- Implement SQLExecutor service with conditional compilation
  - EF6 (net480): Database.SqlQuery<T>()
  - EF Core (net8.0): Database.SqlQueryRaw<T>()
- Register ISQLExecutor in DI (AddInfrastructure, AddInfrastructureInMemory)
  - Scoped lifetime (aligns with DbContext)

ECMJobRunner.Domain/Interfaces/ISQLExecutor.cs

@@ -0,0 +1,20 @@
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace ECMJobRunner.Domain.Interfaces
+{
+    /// <summary>
+    /// Interface for executing SQL queries and mapping results to DTOs
+    /// </summary>
+    public interface ISQLExecutor
+    {
+        /// <summary>
+        /// Executes a SQL query and maps the result to the specified type
+        /// </summary>
+        /// <typeparam name="TResult">The type to map the query result to</typeparam>
+        /// <param name="sql">The SQL query to execute</param>
+        /// <param name="cancellationToken">Cancellation token</param>
+        /// <returns>The mapped result or null if no result</returns>
+        Task<TResult?> ExecuteQueryAsync<TResult>(string sql, CancellationToken cancellationToken = default);
+    }
+}

ECMJobRunner.Infrastructure/DependencyExtension.cs

@@ -8,6 +8,7 @@ using Microsoft.Extensions.DependencyInjection;
 using ECMJobRunner.Domain.Interfaces;
 using ECMJobRunner.Infrastructure.Data;
 using ECMJobRunner.Infrastructure.Repositories;
+using ECMJobRunner.Infrastructure.Services;
 
 namespace ECMJobRunner.Infrastructure
 {
@@ -43,6 +44,9 @@ namespace ECMJobRunner.Infrastructure
             services.AddScoped<IProfileSqlJobRepository, ProfileSqlJobRepository>();
             services.AddScoped<IProfileHistoryRepository, ProfileHistoryRepository>();
 
+            // Register SQL executor as scoped
+            services.AddScoped<ISQLExecutor, SQLExecutor>();
+
             return services;
         }
 
@@ -70,6 +74,9 @@ namespace ECMJobRunner.Infrastructure
             services.AddScoped<IProfileSqlJobRepository, ProfileSqlJobRepository>();
             services.AddScoped<IProfileHistoryRepository, ProfileHistoryRepository>();
 
+            // Register SQL executor as scoped
+            services.AddScoped<ISQLExecutor, SQLExecutor>();
+
             return services;
         }
 #else
@@ -96,6 +103,9 @@ namespace ECMJobRunner.Infrastructure
             services.AddScoped<IProfileSqlJobRepository, ProfileSqlJobRepository>();
             services.AddScoped<IProfileHistoryRepository, ProfileHistoryRepository>();
 
+            // Register SQL executor as scoped
+            services.AddScoped<ISQLExecutor, SQLExecutor>();
+
             return services;
         }
 #endif

ECMJobRunner.Infrastructure/Services/SQLExecutor.cs

@@ -0,0 +1,57 @@
+#if NET48
+using System.Data.Entity;
+using System.Linq;
+#else
+using Microsoft.EntityFrameworkCore;
+#endif
+using ECMJobRunner.Domain.Interfaces;
+using ECMJobRunner.Infrastructure.Data;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace ECMJobRunner.Infrastructure.Services
+{
+    /// <summary>
+    /// Entity Framework implementation of ISQLExecutor
+    /// Executes raw SQL queries and maps results to DTOs
+    /// </summary>
+    public class SQLExecutor : ISQLExecutor
+    {
+        private readonly JobRunnerDbContext _context;
+
+        /// <summary>
+        /// Initializes a new instance of SQLExecutor
+        /// </summary>
+        /// <param name="context">The database context</param>
+        public SQLExecutor(JobRunnerDbContext context)
+        {
+            _context = context;
+        }
+
+        /// <summary>
+        /// Executes a SQL query and maps the result to the specified type
+        /// </summary>
+        /// <typeparam name="TResult">The type to map the query result to</typeparam>
+        /// <param name="sql">The SQL query to execute</param>
+        /// <param name="cancellationToken">Cancellation token</param>
+        /// <returns>The mapped result or null if no result</returns>
+        public async Task<TResult?> ExecuteQueryAsync<TResult>(string sql, CancellationToken cancellationToken = default)
+        {
+#if NET48
+            // Entity Framework 6 implementation
+            var result = await _context.Database
+                .SqlQuery<TResult>(sql)
+                .FirstOrDefaultAsync(cancellationToken);
+            
+            return result;
+#else
+            // Entity Framework Core implementation
+            var result = await _context.Database
+                .SqlQueryRaw<TResult>(sql)
+                .FirstOrDefaultAsync(cancellationToken);
+            
+            return result;
+#endif
+        }
+    }
+}