feat(1099): carry PayeeId through expense create/update/read

Add int? PayeeId to CreateExpenseRequest (UpdateExpenseRequest inherits)
and to ExpenseListItemDto (so it round-trips to the form). Set e.PayeeId
unconditionally in CreateAsync and UpdateAsync so 1099 attribution is
independent of VendorPayment vs StaffReimbursement type. Map PayeeId in
both DTO projections: the paged-list lambda and GetByIdAsync.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

API/ROLAC.API/DTOs/Expense/ExpenseDtos.cs

@@ -35,6 +35,7 @@ public class ExpenseListItemDto
     public string?  ReviewedByName { get; set; }       // resolved Member full name, email fallback
     public DateTimeOffset? ReviewedAt { get; set; }
     public string?  ReviewNotes { get; set; }          // reject reason (or approval note)
+    public int?     PayeeId     { get; set; }
 }
 
 public class ExpenseDto : ExpenseListItemDto
@@ -66,6 +67,7 @@ public class CreateExpenseRequest
     [MaxLength(50)] public string? CheckNumber { get; set; }
     [Required] public DateOnly ExpenseDate { get; set; }
     public string?  Notes { get; set; }
+    public int?     PayeeId { get; set; }
 }
 public class UpdateExpenseRequest : CreateExpenseRequest { }
 

API/ROLAC.API/Services/ExpenseService.cs

@@ -120,6 +120,7 @@ public class ExpenseService : IExpenseService
                 ReviewedByName = e.ReviewedBy != null ? reviewerNames.GetValueOrDefault(e.ReviewedBy) : null,
                 ReviewedAt = e.ReviewedAt,
                 ReviewNotes = e.ReviewNotes,
+                PayeeId = e.PayeeId,
             };
         }).ToList();
 
@@ -211,6 +212,7 @@ public class ExpenseService : IExpenseService
             CheckNumber = e.CheckNumber, Notes = e.Notes, ReviewNotes = e.ReviewNotes,
             ReviewedByName = reviewerName, ReviewedAt = e.ReviewedAt,
             SubmittedBy = e.SubmittedBy, SubmittedAt = e.SubmittedAt, PaidAt = e.PaidAt,
+            PayeeId = e.PayeeId,
             Lines = lineDtos,
         };
     }
@@ -273,6 +275,7 @@ public class ExpenseService : IExpenseService
             e.VendorName = null;
         }
 
+        e.PayeeId = r.PayeeId;
         _db.Expenses.Add(e);
         await _db.SaveChangesAsync();
         return e.Id;
@@ -294,7 +297,7 @@ public class ExpenseService : IExpenseService
             throw new InvalidOperationException("You can only edit your own draft, pending, or rejected reimbursements.");
 
         e.MinistryId = r.MinistryId; e.Description = r.Description; e.CheckNumber = r.CheckNumber;
-        e.ExpenseDate = r.ExpenseDate; e.Notes = r.Notes;
+        e.ExpenseDate = r.ExpenseDate; e.Notes = r.Notes; e.PayeeId = r.PayeeId;
         if (e.Type == "VendorPayment") e.VendorName = r.VendorName;
 
         // Replace the line set wholesale (lines are owned by the header), recompute the total.