[CLAUDE] PE: section Bang so sanh + rename demo email @solutions.com.vn

PART A: Section 'Bang so sanh' (file tong ho so so sanh)

User request: 'theo them cho thong tin ve Bang so sanh, cho dinh kem
file so sanh tong len'.

BE:
 - PurchaseEvaluationAttachmentPurpose.ComparisonTable = 4 (new enum value)
   Backend validator IsInEnum pass, khong can migration (int column).

FE types (2 app):
 - PeAttachmentPurpose.ComparisonTable + Label '4: Bang so sanh'.

FE PeDetailTabs:
 - Them section thu 4 'Bang so sanh (file tong)' sau 'Hang muc + Bao gia'.
 - Component GeneralAttachmentsSection: upload KHONG truyen supplierRowId
   (BE luu NULL) → purpose=ComparisonTable default. Filter attachments
   co supplierRowId===null de render.
 - Card layout khac SupplierAttachmentsCell: full-width card + brand color
   + purpose chip + date. Upload button to hon ([+ Tai len bang so sanh]).
 - readOnly hide upload + delete, giu download.

PART B: Demo email rebrand @solutionerp.local → @solutions.com.vn

User request: 'tao nguoi dung demo theo email cua ben nay'.

BE DbInitializer:
 - Rename 18 email in source: AdminEmail const + 17 demo users
   (bod/pm/ccm/pro/fin/act/equ/hra/qs/nv) — keep password + role unchanged.
 - Them BackfillUserEmailDomainAsync (idempotent): scan user co email
   @solutionerp.local, rename sang @solutions.com.vn, update Email +
   NormalizedEmail + UserName + NormalizedUserName. Skip neu co conflict
   user da ton tai voi email moi. Chay truoc SeedAdmin de tranh tao
   duplicate admin.

Admin permission tao user da co san qua /system/users page.
Comment input khi duyet da co san o PeWorkflowPanel (Ghi chu tuy chon
Textarea) + ContractDetailContent (Yeu cau sua / Duyet tiep dialog).

src/Backend/SolutionErp.Domain/PurchaseEvaluations/PurchaseEvaluationAttachment.cs

@@ -4,9 +4,10 @@ namespace SolutionErp.Domain.PurchaseEvaluations;
 
 public enum PurchaseEvaluationAttachmentPurpose
 {
-    QuoteDocument = 1,        // File báo giá NCC gửi (PDF/xlsx)
+    QuoteDocument = 1,        // File báo giá NCC gửi (PDF/xlsx) — gắn với NCC cụ thể
     RequirementSpec = 2,      // Bản vẽ/yêu cầu kỹ thuật kèm theo
     DecisionExport = 3,       // Bản phiếu duyệt đã export
+    ComparisonTable = 4,      // Bảng so sánh tổng — không gắn với 1 NCC, file tổng hợp
     Other = 99,
 }