[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).

fe-admin/src/components/pe/PeDetailTabs.tsx

@@ -104,6 +104,13 @@ export function PeDetailTabs({
         <Section title={`Hạng mục + Báo giá (${evaluation.details.length})`}>
           <ItemsTab ev={evaluation} readOnly={readOnly} />
         </Section>
+        <Section title="Bảng so sánh (file tổng)">
+          <GeneralAttachmentsSection
+            evaluationId={evaluation.id}
+            attachments={evaluation.attachments.filter(a => a.purchaseEvaluationSupplierId === null)}
+            readOnly={readOnly}
+          />
+        </Section>
       </div>
     </div>
   )
@@ -869,3 +876,140 @@ function SupplierAttachmentsCell({
     </div>
   )
 }
+
+// ===== Section Bảng so sánh — general attachments (không gắn NCC cụ thể) =====
+// Purpose mặc định = ComparisonTable (4). Upload file Excel/PDF tổng hợp so
+// sánh giá N NCC × M hạng mục. Storage path giống SupplierAttachmentsCell
+// nhưng supplierRowId KHÔNG truyền → BE lưu NULL.
+function GeneralAttachmentsSection({
+  evaluationId,
+  attachments,
+  readOnly = false,
+}: {
+  evaluationId: string
+  attachments: PeAttachment[]
+  readOnly?: boolean
+}) {
+  const qc = useQueryClient()
+  const fileInputRef = useRef<HTMLInputElement>(null)
+
+  const upload = useMutation({
+    mutationFn: async (file: File) => {
+      const fd = new FormData()
+      fd.append('file', file)
+      // KHÔNG append supplierRowId → BE set NULL → general attachment
+      fd.append('purpose', String(PeAttachmentPurpose.ComparisonTable))
+      return api.post(`/purchase-evaluations/${evaluationId}/attachments`, fd, {
+        headers: { 'Content-Type': 'multipart/form-data' },
+      })
+    },
+    onSuccess: () => {
+      toast.success('Đã tải lên bảng so sánh.')
+      qc.invalidateQueries({ queryKey: ['pe-detail', evaluationId] })
+    },
+    onError: e => toast.error(getErrorMessage(e)),
+  })
+
+  const del = useMutation({
+    mutationFn: async (attId: string) =>
+      api.delete(`/purchase-evaluations/${evaluationId}/attachments/${attId}`),
+    onSuccess: () => {
+      toast.success('Đã xóa.')
+      qc.invalidateQueries({ queryKey: ['pe-detail', evaluationId] })
+    },
+    onError: e => toast.error(getErrorMessage(e)),
+  })
+
+  async function download(att: PeAttachment) {
+    try {
+      const res = await api.get(
+        `/purchase-evaluations/${evaluationId}/attachments/${att.id}/download`,
+        { responseType: 'blob' },
+      )
+      const url = window.URL.createObjectURL(res.data as Blob)
+      const a = document.createElement('a')
+      a.href = url
+      a.download = att.fileName
+      a.click()
+      window.URL.revokeObjectURL(url)
+    } catch (e) {
+      toast.error(getErrorMessage(e))
+    }
+  }
+
+  function onPick(e: React.ChangeEvent<HTMLInputElement>) {
+    const f = e.target.files?.[0]
+    if (f) upload.mutate(f)
+    e.target.value = ''
+  }
+
+  const fmtSize = (b: number) =>
+    b > 1024 * 1024 ? `${(b / 1024 / 1024).toFixed(1)}MB` : `${Math.round(b / 1024)}KB`
+
+  return (
+    <div>
+      {!readOnly && (
+        <p className="mb-2 text-[12px] text-slate-500">
+          File Excel/PDF tổng hợp so sánh giá của tất cả NCC (không gắn với 1 NCC cụ thể).
+        </p>
+      )}
+      {attachments.length === 0 && readOnly && (
+        <p className="text-sm italic text-slate-400">Chưa có bảng so sánh.</p>
+      )}
+      {attachments.length > 0 && (
+        <div className="mb-2 space-y-1.5">
+          {attachments.map(a => (
+            <div
+              key={a.id}
+              className="flex items-center gap-2 rounded border border-slate-200 bg-white px-3 py-2 text-sm shadow-sm"
+            >
+              <Paperclip className="h-4 w-4 shrink-0 text-brand-500" />
+              <button
+                onClick={() => download(a)}
+                className="min-w-0 flex-1 truncate text-left font-medium text-slate-800 hover:text-brand-700 hover:underline"
+                title={a.fileName}
+              >
+                {a.fileName}
+              </button>
+              <span className="shrink-0 text-[11px] text-slate-500">{fmtSize(a.fileSize)}</span>
+              <span className="shrink-0 rounded bg-brand-50 px-1.5 py-0.5 text-[10px] text-brand-700">
+                {PeAttachmentPurposeLabel[a.purpose] ?? 'Khác'}
+              </span>
+              <span className="shrink-0 text-[10px] text-slate-400">
+                {new Date(a.createdAt).toLocaleDateString('vi-VN')}
+              </span>
+              {!readOnly && (
+                <button
+                  onClick={() => { if (confirm(`Xóa "${a.fileName}"?`)) del.mutate(a.id) }}
+                  className="shrink-0 rounded p-1 text-red-500 hover:bg-red-50"
+                  title="Xóa"
+                >
+                  <Trash2 className="h-3.5 w-3.5" />
+                </button>
+              )}
+            </div>
+          ))}
+        </div>
+      )}
+      {!readOnly && (
+        <div>
+          <input
+            ref={fileInputRef}
+            type="file"
+            accept=".pdf,.doc,.docx,.xls,.xlsx,.png,.jpg,.jpeg,.webp"
+            onChange={onPick}
+            className="hidden"
+          />
+          <button
+            onClick={() => fileInputRef.current?.click()}
+            disabled={upload.isPending}
+            className="inline-flex items-center gap-1.5 rounded border border-dashed border-brand-300 bg-brand-50/50 px-3 py-2 text-xs font-medium text-brand-700 hover:border-brand-500 hover:bg-brand-50 disabled:opacity-50"
+          >
+            <Upload className="h-3.5 w-3.5" />
+            {upload.isPending ? 'Đang tải…' : '+ Tải lên bảng so sánh'}
+          </button>
+        </div>
+      )}
+    </div>
+  )
+}