Add GRN batch and serial tracking

Distribution/Features/Grn/GrnController.cs

@@ -39,6 +39,20 @@ public class GrnController(GrnService service, ICurrentUserService currentUser)
         catch (InvalidOperationException ex) { return Conflict(new { error = ex.Message }); }
     }
 
+    /// <summary>Goods received without a purchase order.</summary>
+    [HttpPost("api/goods-receipts/direct")]
+    public async Task<IActionResult> CreateDirect(CreateDirectGrnRequest request, CancellationToken ct)
+    {
+        var userId = currentUser.UserId ?? request.ReceivedByUserId;
+        if (userId is null) return BadRequest(new { error = "ReceivedByUserId is required while auth is unavailable" });
+        try
+        {
+            var result = await service.CreateDirectAsync(request, userId.Value, ct);
+            return CreatedAtAction(nameof(GetById), new { id = result.Id }, result);
+        }
+        catch (InvalidOperationException ex) { return Conflict(new { error = ex.Message }); }
+    }
+
     [HttpGet("api/purchase-orders/{id:guid}/goods-receipts")]
     public async Task<IActionResult> GetByPurchaseOrder(Guid id) =>
         Ok(await service.GetByPurchaseOrderIdAsync(id));