[CLAUDE] Api+App: Chunk B — PATCH /menus/{key} + DTO extend isVisible/displayLabel

Session 20 turn 7 Chunk B. BE API cho admin Ẩn/Hiện + Đổi tên menu fe-user.

DTO (MenuDtos.cs):
  - MenuNodeDto +IsVisible bool +DisplayLabel string?
  - MenuItemDto +IsVisible bool +DisplayLabel string?

GetMyMenuTreeQueryHandler:
  - Pass m.IsVisible + m.DisplayLabel vào MenuNodeDto record
  - KHÔNG filter IsVisible server-side (FE 2 app tự filter — fe-admin
    render hết, fe-user filter ẩn). Lý do: 1 endpoint serve cả 2 FE.

ListMenuItemsQueryHandler: +IsVisible +DisplayLabel trong Select projection.

NEW UpdateMenuItemCommand + Validator + Handler (PermissionFeatures.cs):
  - Body: { Key, IsVisible, DisplayLabel? }
  - Validator: Key required + max 50, DisplayLabel max 200
  - Handler: load MenuItem by Key (NotFoundException nếu missing), set
    IsVisible + DisplayLabel (whitespace → null normalize), SaveChangesAsync

MenusController +PATCH /api/menus/{key}:
  - [Authorize(Policy = "Permissions.Update")] — reuse policy admin matrix
  - Body: UpdateMenuItemRequest { IsVisible, DisplayLabel? }
  - Send UpdateMenuItemCommand qua MediatR
  - Return 204 NoContent

Verify:
- dotnet build SolutionErp.slnx — 0 err (1 warn cũ DocxRenderer không liên quan)

Pending Chunk C: FE Admin MenuVisibilityPage
Pending Chunk D: FE Layout fe-user filter + render displayLabel
Pending Chunk E: Docs S20 turn 7

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

src/Backend/SolutionErp.Application/Permissions/Dtos/MenuDtos.cs

@@ -10,6 +10,8 @@ public record MenuNodeDto(
     bool CanCreate,
     bool CanUpdate,
     bool CanDelete,
+    bool IsVisible,            // [Mig 27] admin ẩn menu cho fe-user; fe-admin ignore filter này
+    string? DisplayLabel,      // [Mig 27] override label cho fe-user; fe-admin luôn render Label gốc
     List<MenuNodeDto> Children);
 
 public record PermissionDto(
@@ -33,4 +35,6 @@ public record MenuItemDto(
     string Label,
     string? ParentKey,
     int Order,
-    string? Icon);
+    string? Icon,
+    bool IsVisible,
+    string? DisplayLabel);

src/Backend/SolutionErp.Application/Permissions/PermissionFeatures.cs

@@ -19,11 +19,44 @@ public class ListMenuItemsQueryHandler(IApplicationDbContext db) : IRequestHandl
     {
         return await db.MenuItems.AsNoTracking()
             .OrderBy(m => m.Order)
-            .Select(m => new MenuItemDto(m.Key, m.Label, m.ParentKey, m.Order, m.Icon))
+            .Select(m => new MenuItemDto(m.Key, m.Label, m.ParentKey, m.Order, m.Icon, m.IsVisible, m.DisplayLabel))
             .ToListAsync(ct);
     }
 }
 
+// ========== Update menu visibility + display label (admin only) ==========
+// Session 20 Mig 27: admin Ẩn/Hiện + Đổi tên hiển thị menu cho fe-user (eOffice).
+// fe-admin sidebar luôn render Label gốc (KHÔNG dùng DisplayLabel) — user Q2=b.
+public record UpdateMenuItemCommand(
+    string Key,
+    bool IsVisible,
+    string? DisplayLabel) : IRequest;
+
+public class UpdateMenuItemCommandValidator : AbstractValidator<UpdateMenuItemCommand>
+{
+    public UpdateMenuItemCommandValidator()
+    {
+        RuleFor(x => x.Key).NotEmpty().MaximumLength(50);
+        RuleFor(x => x.DisplayLabel).MaximumLength(200);
+    }
+}
+
+public class UpdateMenuItemCommandHandler(IApplicationDbContext db) : IRequestHandler<UpdateMenuItemCommand>
+{
+    public async Task Handle(UpdateMenuItemCommand request, CancellationToken ct)
+    {
+        var menu = await db.MenuItems.FirstOrDefaultAsync(m => m.Key == request.Key, ct)
+            ?? throw new NotFoundException("MenuItem", request.Key);
+
+        menu.IsVisible = request.IsVisible;
+        menu.DisplayLabel = string.IsNullOrWhiteSpace(request.DisplayLabel)
+            ? null
+            : request.DisplayLabel.Trim();
+
+        await db.SaveChangesAsync(ct);
+    }
+}
+
 // ========== List permissions by role (matrix edit) ==========
 
 public record ListPermissionsByRoleQuery(Guid RoleId) : IRequest<List<PermissionDto>>;

src/Backend/SolutionErp.Application/Permissions/Queries/GetMyMenuTree/GetMyMenuTreeQuery.cs

@@ -85,6 +85,7 @@ public class GetMyMenuTreeQueryHandler(
 
                 return new MenuNodeDto(m.Key, m.Label, m.ParentKey, m.Order, m.Icon,
                     flags.Item1, flags.Item2, flags.Item3, flags.Item4,
+                    m.IsVisible, m.DisplayLabel,
                     BuildChildren(m.Key, nextInherit));
             })
             .ToList();