feat(application): add inactive profile validation with custom exception

- Create InactiveProfileException for profile active status validation
- Update TriggeringDEXJobBatchCommand to check profile active status before execution
- Add ICfgProfileRepository dependency to batch command handler
- Throw InactiveProfileException when attempting to execute inactive profiles
- Add profile not found validation with descriptive error message
- Reorganize commands under DEXJob/Commands directory structure

ECMJobRunner.Application/DEXJob/Commands/TriggeringDEXJobCommand.cs

@@ -0,0 +1,51 @@
+using ECMJobRunner.Domain.Entities;
+using MediatR;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace ECMJobRunner.Application.DEXJob.Commands
+{
+    /// <summary>
+    /// Command to trigger a single DEX job execution
+    /// Execution logic is handled by pipeline behaviors:
+    /// 1. MainQueryExecutionBehavior - executes main SQL query
+    /// 2. CheckQueryExecutionBehavior - validates with check SQL query
+    /// 3. ReCRequestExecutionBehavior - invokes ReC HTTP request
+    /// </summary>
+    public class TriggeringDEXJobCommand : IRequest<Unit>
+    {
+        /// <summary>
+        /// The SQL job to execute
+        /// </summary>
+        public ProfileSqlJob Job { get; set; } = null!;
+
+        /// <summary>
+        /// Unique batch identifier for this execution
+        /// </summary>
+        public string BatchId { get; set; } = null!;
+    }
+
+    /// <summary>
+    /// Handler for TriggeringDEXJobCommand
+    /// All execution logic is delegated to pipeline behaviors
+    /// This handler simply returns completion after behaviors execute
+    /// </summary>
+    public class TriggeringDEXJobCommandHandler : IRequestHandler<TriggeringDEXJobCommand, Unit>
+    {
+        /// <summary>
+        /// Handles the TriggeringDEXJobCommand
+        /// Returns immediately as behaviors perform all work
+        /// </summary>
+        /// <param name="request">The command containing job and batch ID</param>
+        /// <param name="cancellationToken">Cancellation token</param>
+        /// <returns>Unit value indicating completion</returns>
+        public Task<Unit> Handle(TriggeringDEXJobCommand request, CancellationToken cancellationToken)
+        {
+            // All execution logic is handled by pipeline behaviors:
+            // - MainQueryExecutionBehavior
+            // - CheckQueryExecutionBehavior
+            // - ReCRequestExecutionBehavior
+            return Task.FromResult(Unit.Value);
+        }
+    }
+}