Fix user ID handling in GRN and PO

Distribution/Features/Grn/GrnController.cs

@@ -26,11 +26,14 @@ public class GrnController(GrnService service, ICurrentUserService currentUser)
     [HttpPost("api/goods-receipts")]
     public async Task<IActionResult> CreateFlat(CreateFlatGrnRequest request, CancellationToken ct)
     {
-        var userId = currentUser.UserId ?? throw new UnauthorizedAccessException();
+        // TEMPORARY: currentUser.UserId is always unset due to the broken auth middleware
+        // (testbug.md #28) — fall back to the explicitly supplied user until that's fixed.
+        var userId = currentUser.UserId ?? request.ReceivedByUserId;
+        if (userId is null) return BadRequest(new { error = "ReceivedByUserId is required while auth is unavailable" });
         try
         {
             var inner = new CreateGrnRequest(request.WarehouseId, request.Items);
-            var result = await service.CreateAsync(request.PurchaseOrderId, inner, userId, ct);
+            var result = await service.CreateAsync(request.PurchaseOrderId, inner, userId.Value, ct);
             return CreatedAtAction(nameof(GetById), new { id = result.Id }, result);
         }
         catch (InvalidOperationException ex) { return Conflict(new { error = ex.Message }); }
@@ -43,10 +46,11 @@ public class GrnController(GrnService service, ICurrentUserService currentUser)
     [HttpPost("api/purchase-orders/{id:guid}/goods-receipts")]
     public async Task<IActionResult> Create(Guid id, CreateGrnRequest request, CancellationToken ct)
     {
-        var userId = currentUser.UserId ?? throw new UnauthorizedAccessException();
+        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.CreateAsync(id, request, userId, ct);
+            var result = await service.CreateAsync(id, request, userId.Value, ct);
             return CreatedAtAction(nameof(GetById), new { id = result.Id }, result);
         }
         catch (InvalidOperationException ex) { return Conflict(new { error = ex.Message }); }