[CLAUDE] Office: P11-E AttendanceReport+Excel+OtPolicy + P11-F MaTicket codegen (Wave 1)

P11-F: MaTicket gen-on-create qua WorkflowAppCodeGen (IT/2026/NNN Serializable atomic, kanban no-workflow). P11-E: GetAttendanceReportQuery monthly aggregate (day-type weekday/weekend/holiday OT x OtPolicy multiplier in-memory) + AttendanceReportExcelExporter (ClosedXML) + 2 endpoint Admin-only + fe-admin AttendanceReportPage. Migration-free. +5 test (186->191). reviewer PASS (gotcha #44 role-string verified, 0 blocker).

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

src/Backend/SolutionErp.Infrastructure/DependencyInjection.cs

@@ -38,6 +38,7 @@ public static class DependencyInjection
         services.AddScoped<IPurchaseEvaluationCodeGenerator, PurchaseEvaluationCodeGenerator>();
         services.AddScoped<IEmployeeCodeGenerator, EmployeeCodeGenerator>();
         services.AddScoped<IContractExcelExporter, ContractExcelExporter>();
+        services.AddScoped<IAttendanceReportExcelExporter, AttendanceReportExcelExporter>();
         services.AddScoped<INotificationService, NotificationService>();
         services.AddScoped<IChangelogService, ChangelogService>();
         services.AddSingleton<IFileStorage, LocalFileStorage>();

src/Backend/SolutionErp.Infrastructure/Reports/AttendanceReportExcelExporter.cs

@@ -0,0 +1,87 @@
+using ClosedXML.Excel;
+using SolutionErp.Application.Forms.Services;
+using SolutionErp.Application.Office;
+using SolutionErp.Application.Reports.Services;
+
+namespace SolutionErp.Infrastructure.Reports;
+
+// Phase 11 P11-E — mirror ContractExcelExporter (ClosedXML XLWorkbook → MemoryStream → RenderResult).
+// Input = AttendanceReportDto (controller query rồi pass — KHÔNG đụng DB).
+public class AttendanceReportExcelExporter : IAttendanceReportExcelExporter
+{
+    public RenderResult Export(AttendanceReportDto report)
+    {
+        using var wb = new XLWorkbook();
+        var ws = wb.Worksheets.Add("ChamCong");
+
+        // Title row
+        var headers = new[]
+        {
+            "STT", "Họ tên", "Phòng ban", "Ngày công", "Tổng giờ làm",
+            "OT thường", "OT cuối tuần", "OT lễ", "OT quy đổi"
+        };
+        var titleRange = ws.Range(1, 1, 1, headers.Length);
+        titleRange.Merge();
+        titleRange.Value = $"BÁO CÁO CHẤM CÔNG THÁNG {report.Month}/{report.Year}";
+        titleRange.Style.Font.Bold = true;
+        titleRange.Style.Font.FontSize = 14;
+        titleRange.Style.Alignment.Horizontal = XLAlignmentHorizontalValues.Center;
+
+        // Header row
+        const int headerRowIdx = 2;
+        for (int i = 0; i < headers.Length; i++)
+            ws.Cell(headerRowIdx, i + 1).Value = headers[i];
+
+        var headerRange = ws.Range(headerRowIdx, 1, headerRowIdx, headers.Length);
+        headerRange.Style.Font.Bold = true;
+        headerRange.Style.Fill.BackgroundColor = XLColor.LightBlue;
+        headerRange.Style.Alignment.Horizontal = XLAlignmentHorizontalValues.Center;
+
+        // Data rows
+        const int firstDataRow = headerRowIdx + 1;
+        for (int i = 0; i < report.Rows.Count; i++)
+        {
+            var r = report.Rows[i];
+            var rowIdx = firstDataRow + i;
+            ws.Cell(rowIdx, 1).Value = i + 1;
+            ws.Cell(rowIdx, 2).Value = r.FullName;
+            ws.Cell(rowIdx, 3).Value = r.DepartmentName ?? "—";
+            ws.Cell(rowIdx, 4).Value = r.DaysPresent;
+            ws.Cell(rowIdx, 5).Value = r.TotalWorkHours;
+            ws.Cell(rowIdx, 5).Style.NumberFormat.Format = "#,##0.0#";
+            ws.Cell(rowIdx, 6).Value = r.OtWeekday;
+            ws.Cell(rowIdx, 6).Style.NumberFormat.Format = "#,##0.0#";
+            ws.Cell(rowIdx, 7).Value = r.OtWeekend;
+            ws.Cell(rowIdx, 7).Style.NumberFormat.Format = "#,##0.0#";
+            ws.Cell(rowIdx, 8).Value = r.OtHoliday;
+            ws.Cell(rowIdx, 8).Style.NumberFormat.Format = "#,##0.0#";
+            ws.Cell(rowIdx, 9).Value = r.OtWeighted;
+            ws.Cell(rowIdx, 9).Style.NumberFormat.Format = "#,##0.0#";
+        }
+
+        // Footer total row
+        if (report.Rows.Count > 0)
+        {
+            var sumRow = firstDataRow + report.Rows.Count;
+            ws.Cell(sumRow, 4).Value = "TỔNG:";
+            ws.Cell(sumRow, 4).Style.Font.Bold = true;
+            ws.Cell(sumRow, 4).Style.Alignment.Horizontal = XLAlignmentHorizontalValues.Right;
+            ws.Cell(sumRow, 5).Value = report.GrandTotalWorkHours;
+            ws.Cell(sumRow, 5).Style.NumberFormat.Format = "#,##0.0#";
+            ws.Cell(sumRow, 5).Style.Font.Bold = true;
+            ws.Cell(sumRow, 9).Value = report.GrandTotalOtWeighted;
+            ws.Cell(sumRow, 9).Style.NumberFormat.Format = "#,##0.0#";
+            ws.Cell(sumRow, 9).Style.Font.Bold = true;
+        }
+
+        ws.Columns().AdjustToContents();
+        ws.SheetView.FreezeRows(headerRowIdx);
+
+        using var ms = new MemoryStream();
+        wb.SaveAs(ms);
+        return new RenderResult(
+            ms.ToArray(),
+            $"BaoCao-ChamCong-{report.Year}-{report.Month:D2}.xlsx",
+            "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
+    }
+}