[CLAUDE] PurchaseEvaluation: Mig 55 ô "Ghi chú từ CCM" ngân sách gói thầu — CCM nhập số + ghi lý do giống PRO

- Entity PeWorkItemBudget +CcmNote (mirror ProNote, nvarchar 1000) + Mig 55 additive-nullable
- UpdatePeBudgetCcmCommand +CcmNote absolute-set, role-gate CostControl/Admin fail-closed
- DTO PeBudgetSummaryDto +CcmNote + controller BudgetCcmBody + GET mapping
- FE 2 app SHA-mirror: dòng "Ghi chú từ CCM" gate canEditCcm (sau V0/hiệu chỉnh), absolute-set đủ 3 field
- Test +5 (set CCM/Admin, null-clear, non-priv Forbidden, all-3-persist) -> 339 pass

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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

@@ -20,6 +20,7 @@ public class PeWorkItemBudgetConfiguration : IEntityTypeConfiguration<PeWorkItem
         b.Property(x => x.InitialAmount).HasPrecision(18, 2);
         b.Property(x => x.AdjustmentAmount).HasPrecision(18, 2);
         b.Property(x => x.ProNote).HasMaxLength(1000);
+        b.Property(x => x.CcmNote).HasMaxLength(1000);
 
         b.HasIndex(x => new { x.ProjectId, x.WorkItemId })
             .IsUnique()

src/Backend/SolutionErp.Infrastructure/Persistence/Migrations/20260618105426_AddCcmNoteToPeWorkItemBudget.cs

@@ -0,0 +1,29 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace SolutionErp.Infrastructure.Persistence.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddCcmNoteToPeWorkItemBudget : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<string>(
+                name: "CcmNote",
+                table: "PeWorkItemBudgets",
+                type: "nvarchar(1000)",
+                maxLength: 1000,
+                nullable: true);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "CcmNote",
+                table: "PeWorkItemBudgets");
+        }
+    }
+}

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

@@ -4523,6 +4523,10 @@ namespace SolutionErp.Infrastructure.Persistence.Migrations
                         .HasPrecision(18, 2)
                         .HasColumnType("decimal(18,2)");
 
+                    b.Property<string>("CcmNote")
+                        .HasMaxLength(1000)
+                        .HasColumnType("nvarchar(1000)");
+
                     b.Property<DateTime>("CreatedAt")
                         .HasColumnType("datetime2");