[CLAUDE] Domain: Chunk A — Mig 31 swap F2 storage Users→ApprovalWorkflowLevels (Approver scope ChoDuyet)

Mig 31 RefactorSkipToFinalToApproverLevel — 2 stage manual reorder:
- ADD ApprovalWorkflowLevels.AllowApproverSkipToFinal bit NOT NULL DEFAULT 0
- DROP Users.AllowDrafterSkipToFinal (semantic mới khác hẳn — admin re-config qua Designer)
- NO BACKFILL (Option A — accept lose 4 prod user value per K0-bis audit)

Plan K refactor F2 semantic: Drafter from Nháp → Approver during ChoDuyet skip thẳng Cấp cuối.
Mirror F3+F4 admin opt-in per-Approver-slot pattern (Mig 29 + Mig 30) reinforced 3× cumulative.

Service line 121-157 F2 Drafter SUBMIT branch REMOVED stub (K2 sẽ add Approver F2 branch
trong APPROVE STEP line ~393-525). TransitionAsync skipToFinal param 8th KEPT cho K2 repurpose.

Application layer compile-break fix transient: UserDto field mapping + GET handler + LIST
handler + SetUserAllowDrafterSkipToFinalCommandHandler NoOp + PurchaseEvaluationFeatures
drafter flag → sentinel false. DTO + Command signature UNCHANGED (K2 chunk Chủ trì sẽ
refactor DTO/Command theo plan).

4 prod user (fin.pp + pm.nv + nv.test + truong.nguyen) lose AllowDrafterSkipToFinal=true
per bro Option A. Audit trail trong session log K8.

Verify:
- dotnet ef migrations add pass
- dotnet ef database update Dev + Design pass (Mig 31 applied both DB)
- dotnet build src/Backend/SolutionErp.Api production projects clean (0 err, 0 warn)
- dotnet test SKIPPED per UAT mode (memory feedback_uat_skip_verify) — K7 chunk fix
  remaining PurchaseEvaluationWorkflowServiceReturnModeTests.cs:253 reference

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/Backend/SolutionErp.Infrastructure/Services/PurchaseEvaluationWorkflowService.cs

@@ -118,43 +118,16 @@ public class PurchaseEvaluationWorkflowService(
             }
             evaluation.Phase = PurchaseEvaluationPhase.ChoDuyet;
 
-            // F2 (Mig 29 — S21 t5) — Drafter skip thẳng Cấp cuối. Permission
-            // check moved sang `User.AllowDrafterSkipToFinal` (per-Drafter user,
-            // không còn workflow-level Mig 28).
-            // Admin bypass user flag check.
-            if (skipToFinal && evaluation.ApprovalWorkflowId is Guid skipAwId)
-            {
-                if (!isAdmin)
-                {
-                    if (actorUserId is null)
-                        throw new ConflictException("skipToFinal yêu cầu authenticated user.");
-                    var drafterUser = await userManager.FindByIdAsync(actorUserId.Value.ToString())
-                        ?? throw new ConflictException("User không tồn tại.");
-                    if (!drafterUser.AllowDrafterSkipToFinal)
-                        throw new ConflictException(
-                            $"User '{drafterUser.FullName}' không được phép gửi thẳng Cấp cuối. " +
-                            "Liên hệ Admin để cấp quyền ở User Management.");
-                }
-                var wfSkip = await db.ApprovalWorkflows
-                    .Include(w => w.Steps).ThenInclude(s => s.Levels)
-                    .FirstOrDefaultAsync(w => w.Id == skipAwId, ct)
-                    ?? throw new ConflictException("Workflow không tồn tại.");
-                var finalStep = wfSkip.Steps.OrderBy(s => s.Order).LastOrDefault()
-                    ?? throw new ConflictException("Workflow chưa có Bước nào.");
-                var finalLevelOrder = finalStep.Levels.OrderBy(l => l.Order).LastOrDefault()?.Order
-                    ?? throw new ConflictException($"Bước {finalStep.Order} chưa có Cấp nào.");
-                evaluation.CurrentWorkflowStepIndex = wfSkip.Steps.Count - 1;  // 0-based last step
-                evaluation.CurrentApprovalLevelOrder = finalLevelOrder;
-                comment = string.IsNullOrWhiteSpace(comment)
-                    ? "[Drafter gửi thẳng Cấp cuối — skip Bước/Cấp trung gian]"
-                    : $"{comment} [Drafter gửi thẳng Cấp cuối — skip Bước/Cấp trung gian]";
-            }
-            else
-            {
-                evaluation.CurrentWorkflowStepIndex = 0;
-                // Chỉ init levelOrder=1 nếu pin schema V2 (ApprovalWorkflowId set).
-                evaluation.CurrentApprovalLevelOrder = evaluation.ApprovalWorkflowId is not null ? 1 : null;
-            }
+            // Mig 31 (S23 t1 Plan K Chunk A) — F2 Drafter SUBMIT skipToFinal branch
+            // REMOVED stub. Semantic refactor: F2 cũ Drafter-skip-from-Nháp → mới
+            // Approver-skip-during-ChoDuyet (storage move sang
+            // ApprovalWorkflowLevels.AllowApproverSkipToFinal per-slot Approver).
+            // TransitionAsync `bool skipToFinal` 8th param KEPT cho K2 sẽ repurpose
+            // to APPROVE STEP branch (line ~393-525 V2 path).
+            // K2 sẽ add Approver F2 branch trong APPROVE STEP (line ~393-525)
+            evaluation.CurrentWorkflowStepIndex = 0;
+            // Chỉ init levelOrder=1 nếu pin schema V2 (ApprovalWorkflowId set).
+            evaluation.CurrentApprovalLevelOrder = evaluation.ApprovalWorkflowId is not null ? 1 : null;
             evaluation.SlaDeadline = dateTime.UtcNow.AddDays(7);
             await LogTransitionAsync(evaluation, fromPhase, PurchaseEvaluationPhase.ChoDuyet, actorUserId, decision, comment, ct);
             await db.SaveChangesAsync(ct);