feat(admin): improve tenant bulk import reporting with detailed results

- Backend: Enhanced 'ImportTenantsCSV' to return row-by-row details including action, status, and modified fields.
- Backend: Refactored 'upsertTenantCSVRecord' to detect and return specific modified fields (Name, Type, ParentID, Slug, Description, Config, Domains).
- Frontend: Added 'TenantImportDetail' and updated 'TenantImportResult' types.
- Frontend: Implemented a detailed results modal in 'TenantListPage' showing processing summary and row-level feedback for better transparency.

adminfront/src/features/tenants/routes/TenantListPage.tsx

@@ -285,6 +285,9 @@ function TenantListPage() {
     Record<number, string>
   >({});
   const [previewOpen, setPreviewOpen] = React.useState(false);
+  const [importResult, setImportResult] =
+    React.useState<TenantImportResult | null>(null);
+  const [importResultOpen, setImportResultOpen] = React.useState(false);
   const [selectedBulkStatus, setSelectedBulkStatus] = React.useState("");
   const _tenantTableScrollRef = React.useRef<HTMLDivElement | null>(null);
 
@@ -387,17 +390,8 @@ function TenantListPage() {
   const importMutation = useMutation({
     mutationFn: (file: File) => importTenantsCSV(file),
     onSuccess: (result) => {
-      setImportMessage(
-        t(
-          "msg.admin.tenants.import_result",
-          "생성 {{created}}, 갱신 {{updated}}, 실패 {{failed}}",
-          {
-            created: result.created,
-            updated: result.updated,
-            failed: result.failed,
-          },
-        ),
-      );
+      setImportResult(result);
+      setImportResultOpen(true);
       setPreviewOpen(false);
       setPreviewRows([]);
       setSelectedMatches({});
@@ -1006,6 +1000,128 @@ function TenantListPage() {
         </div>
       )}
 
+      <Dialog open={importResultOpen} onOpenChange={setImportResultOpen}>
+        <DialogContent className="max-w-5xl">
+          <DialogHeader>
+            <DialogTitle>
+              {t(
+                "ui.admin.tenants.import_result.title",
+                "가져오기 결과 리포트",
+              )}
+            </DialogTitle>
+            <DialogDescription>
+              {importResult &&
+                t(
+                  "msg.admin.tenants.import_result.summary",
+                  "총 {{total}}건 처리: 생성 {{created}}, 갱신 {{updated}}, 실패 {{failed}}",
+                  {
+                    total: importResult.details.length,
+                    created: importResult.created,
+                    updated: importResult.updated,
+                    failed: importResult.failed,
+                  },
+                )}
+            </DialogDescription>
+          </DialogHeader>
+
+          <div className="max-h-[60vh] overflow-auto rounded-md border">
+            <Table>
+              <TableHeader className={commonStickyTableHeaderClass}>
+                <TableRow>
+                  <TableHead className="w-[72px]">
+                    {t("ui.common.row", "행")}
+                  </TableHead>
+                  <TableHead>
+                    {t("ui.admin.tenants.table.name", "NAME")}
+                  </TableHead>
+                  <TableHead>
+                    {t("ui.admin.tenants.table.slug", "SLUG")}
+                  </TableHead>
+                  <TableHead>
+                    {t("ui.admin.tenants.import_result.action", "작업")}
+                  </TableHead>
+                  <TableHead>
+                    {t("ui.admin.tenants.import_result.status", "상태")}
+                  </TableHead>
+                  <TableHead>
+                    {t("ui.admin.tenants.import_result.message", "상세 내용")}
+                  </TableHead>
+                </TableRow>
+              </TableHeader>
+              <TableBody>
+                {importResult?.details.map((detail) => (
+                  <TableRow key={detail.row}>
+                    <TableCell className="font-mono text-xs">
+                      {detail.row}
+                    </TableCell>
+                    <TableCell className="font-medium">{detail.name}</TableCell>
+                    <TableCell className="font-mono text-xs">
+                      {detail.slug}
+                    </TableCell>
+                    <TableCell>
+                      <Badge
+                        variant={
+                          detail.action === "created"
+                            ? "success"
+                            : detail.action === "updated"
+                              ? "warning"
+                              : detail.action === "skipped"
+                                ? "outline"
+                                : "destructive"
+                        }
+                        className="text-[10px]"
+                      >
+                        {detail.action.toUpperCase()}
+                      </Badge>
+                    </TableCell>
+                    <TableCell>
+                      {detail.success ? (
+                        <Badge variant="success" className="text-[10px]">
+                          SUCCESS
+                        </Badge>
+                      ) : (
+                        <Badge variant="destructive" className="text-[10px]">
+                          FAILED
+                        </Badge>
+                      )}
+                    </TableCell>
+                    <TableCell className="text-xs">
+                      {detail.message}
+                      {detail.modifiedFields &&
+                        detail.modifiedFields.length > 0 && (
+                          <div className="mt-1 flex flex-wrap gap-1">
+                            <span className="mr-1 text-muted-foreground">
+                              {t(
+                                "ui.admin.tenants.import_result.modified",
+                                "수정됨:",
+                              )}
+                            </span>
+                            {detail.modifiedFields.map((field) => (
+                              <Badge
+                                key={field}
+                                variant="outline"
+                                className="bg-muted text-[10px]"
+                              >
+                                {field}
+                              </Badge>
+                            ))}
+                          </div>
+                        )}
+                    </TableCell>
+                  </TableRow>
+                ))}
+              </TableBody>
+            </Table>
+          </div>
+
+          <DialogFooter>
+            <Button onClick={() => setImportResultOpen(false)}>
+              {t("ui.common.confirm", "확인")}
+            </Button>
+          </DialogFooter>
+        </DialogContent>
+      </Dialog>
+
       <Dialog open={previewOpen} onOpenChange={setPreviewOpen}>
         <DialogContent className="max-w-5xl">
           <DialogHeader>

adminfront/src/lib/adminApi.ts

@@ -70,11 +70,22 @@ export type TenantUpdateRequest = {
   config?: Record<string, unknown>;
 };
 
+export type TenantImportDetail = {
+  row: number;
+  slug: string;
+  name: string;
+  success: boolean;
+  action: "created" | "updated" | "failed" | "skipped";
+  message: string;
+  modifiedFields?: string[];
+};
+
 export type TenantImportResult = {
   created: number;
   updated: number;
   failed: number;
   errors: string[];
+  details: TenantImportDetail[];
 };
 
 export type ApiKeySummary = {