[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.Api/Controllers/PurchaseEvaluationsController.cs

@@ -80,10 +80,10 @@ public class PurchaseEvaluationsController(IMediator mediator) : ControllerBase
     [HttpPut("{id:guid}/budget/ccm")]
     public async Task<IActionResult> UpdateBudgetCcm(Guid id, [FromBody] BudgetCcmBody body, CancellationToken ct)
     {
-        await mediator.Send(new UpdatePeBudgetCcmCommand(id, body.InitialAmount, body.AdjustmentAmount), ct);
+        await mediator.Send(new UpdatePeBudgetCcmCommand(id, body.InitialAmount, body.AdjustmentAmount, body.CcmNote), ct);
         return NoContent();
     }
-    public record BudgetCcmBody(decimal? InitialAmount, decimal? AdjustmentAmount);
+    public record BudgetCcmBody(decimal? InitialAmount, decimal? AdjustmentAmount, string? CcmNote);
 
     // [S69 2026-06-17] Cờ gấp (urgent) — anh Kiệt FDC. Class [Authorize] any-auth;
     // handler fine-grained Forbidden theo role (PRO=Procurement set cờ đỏ, CCM=