[CLAUDE] PurchaseEvaluation: User chọn quy trình duyệt V2 lúc tạo phiếu (Mig 23)

User feedback: thay field "Loại quy trình (theo menu — khóa)" disabled
→ Select dropdown cho User pick quy trình ApprovalWorkflowsV2 (Mig 22)
ngay từ workspace tạo mới. Hiển thị "Mã + Tên + Version".

BE Domain:
- PurchaseEvaluation +ApprovalWorkflowId Guid? (nullable, FK Restrict)
- EF Configuration: Index + FK Restrict to ApprovalWorkflows
- Migration 23 `AddApprovalWorkflowIdToPurchaseEvaluation` (1 ALTER +
  1 IX + 1 FK), applied cả _Design + _Dev LocalDB
- Field WorkflowDefinitionId (Mig 21 legacy) giữ song song để Service
  PE chạy logic cũ tới khi Session sau wire qua schema mới

BE Application:
- CreatePurchaseEvaluationCommand +ApprovalWorkflowId? Guid? optional
  param (default null)
- Validate: nếu set, phải tồn tại + ApplicableType khớp PE.Type
  (DuyetNcc=1 → ApprovalWorkflowApplicableType.DuyetNcc, etc)
- Handler set entity.ApprovalWorkflowId từ request
- UpdatePurchaseEvaluationDraftCommand mirror — cho User đổi quy trình
  khi sửa Nháp/Trả lại (validate same)
- PurchaseEvaluationDetailBundleDto +ApprovalWorkflowId/Code/Name/Version
- GetPurchaseEvaluationByIdQuery handler load workflow info join
- Update Phase guard: cho sửa cả DangSoanThao + TraLai (Trả lại =
  editable per Session 17 spec)

FE (cả 2 app mirror):
- types/purchaseEvaluation.ts: PeDetail +approvalWorkflowId/Code/Name/Version
- PeWorkspaceCreateView.tsx:
  - Replace field disabled "Loại quy trình" → Select bắt buộc
  - useQuery `/api/approval-workflows-v2?applicableType=N` filter theo
    defaultType (1=DuyetNcc / 2=DuyetNccPhuongAn)
  - Display option: "QT-DN-V2-001 v01 — Quy trình Duyệt NCC (đang áp dụng)"
  - List cả version active + archived (UAT cần test compare)
  - Empty state hint amber "Chưa có quy trình, vào /system/approval-workflows-v2"
  - canSubmit require approvalWorkflowId set
  - POST payload include approvalWorkflowId

Verify: dotnet build OK · 81 test pass · npm build × 2 OK · Mig 23 applied
cả 2 LocalDB.

Logic Service PE chưa wire qua ApprovalWorkflowId — vẫn pin
WorkflowDefinitionId Mig 21 legacy chạy. Session sau wire Service iterate
ApprovalWorkflowSteps + match approver theo schema V2 + drop legacy.

src/Backend/SolutionErp.Infrastructure/Persistence/Configurations/PurchaseEvaluationConfiguration.cs

@@ -27,9 +27,18 @@ public class PurchaseEvaluationConfiguration : IEntityTypeConfiguration<Purchase
         b.HasIndex(x => x.ProjectId);
         b.HasIndex(x => x.SlaDeadline);
         b.HasIndex(x => x.WorkflowDefinitionId);
+        b.HasIndex(x => x.ApprovalWorkflowId);
         b.HasIndex(x => x.ContractId);
         b.HasIndex(x => x.BudgetId);
 
+        // FK ApprovalWorkflowId Restrict (Mig 23 Session 17) — schema mới
+        // ApprovalWorkflowsV2 pin lúc create. Restrict để KHÔNG xóa workflow
+        // nếu còn phiếu pin.
+        b.HasOne<SolutionErp.Domain.ApprovalWorkflowsV2.ApprovalWorkflow>()
+            .WithMany()
+            .HasForeignKey(x => x.ApprovalWorkflowId)
+            .OnDelete(DeleteBehavior.Restrict);
+
         b.HasMany(x => x.Suppliers).WithOne(s => s.PurchaseEvaluation).HasForeignKey(s => s.PurchaseEvaluationId).OnDelete(DeleteBehavior.Cascade);
         b.HasMany(x => x.Details).WithOne(d => d.PurchaseEvaluation).HasForeignKey(d => d.PurchaseEvaluationId).OnDelete(DeleteBehavior.Cascade);
         b.HasMany(x => x.Approvals).WithOne(a => a.PurchaseEvaluation).HasForeignKey(a => a.PurchaseEvaluationId).OnDelete(DeleteBehavior.Cascade);

src/Backend/SolutionErp.Infrastructure/Persistence/Migrations/20260508072821_AddApprovalWorkflowIdToPurchaseEvaluation.cs

@@ -0,0 +1,50 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace SolutionErp.Infrastructure.Persistence.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddApprovalWorkflowIdToPurchaseEvaluation : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<Guid>(
+                name: "ApprovalWorkflowId",
+                table: "PurchaseEvaluations",
+                type: "uniqueidentifier",
+                nullable: true);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_PurchaseEvaluations_ApprovalWorkflowId",
+                table: "PurchaseEvaluations",
+                column: "ApprovalWorkflowId");
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_PurchaseEvaluations_ApprovalWorkflows_ApprovalWorkflowId",
+                table: "PurchaseEvaluations",
+                column: "ApprovalWorkflowId",
+                principalTable: "ApprovalWorkflows",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Restrict);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropForeignKey(
+                name: "FK_PurchaseEvaluations_ApprovalWorkflows_ApprovalWorkflowId",
+                table: "PurchaseEvaluations");
+
+            migrationBuilder.DropIndex(
+                name: "IX_PurchaseEvaluations_ApprovalWorkflowId",
+                table: "PurchaseEvaluations");
+
+            migrationBuilder.DropColumn(
+                name: "ApprovalWorkflowId",
+                table: "PurchaseEvaluations");
+        }
+    }
+}

src/Backend/SolutionErp.Infrastructure/Persistence/Migrations/ApplicationDbContextModelSnapshot.cs

@@ -2485,6 +2485,9 @@ namespace SolutionErp.Infrastructure.Persistence.Migrations
                         .ValueGeneratedOnAdd()
                         .HasColumnType("uniqueidentifier");
 
+                    b.Property<Guid?>("ApprovalWorkflowId")
+                        .HasColumnType("uniqueidentifier");
+
                     b.Property<Guid?>("BudgetId")
                         .HasColumnType("uniqueidentifier");
 
@@ -2578,6 +2581,8 @@ namespace SolutionErp.Infrastructure.Persistence.Migrations
 
                     b.HasKey("Id");
 
+                    b.HasIndex("ApprovalWorkflowId");
+
                     b.HasIndex("BudgetId");
 
                     b.HasIndex("ContractId");
@@ -3562,6 +3567,14 @@ namespace SolutionErp.Infrastructure.Persistence.Migrations
                         .OnDelete(DeleteBehavior.Restrict);
                 });
 
+            modelBuilder.Entity("SolutionErp.Domain.PurchaseEvaluations.PurchaseEvaluation", b =>
+                {
+                    b.HasOne("SolutionErp.Domain.ApprovalWorkflowsV2.ApprovalWorkflow", null)
+                        .WithMany()
+                        .HasForeignKey("ApprovalWorkflowId")
+                        .OnDelete(DeleteBehavior.Restrict);
+                });
+
             modelBuilder.Entity("SolutionErp.Domain.PurchaseEvaluations.PurchaseEvaluationApproval", b =>
                 {
                     b.HasOne("SolutionErp.Domain.PurchaseEvaluations.PurchaseEvaluation", "PurchaseEvaluation")