feat: visually distinguish digital-twin linked tenants

- Add has_digital_twin flag to tenant API response
- Show cloud badge on tenant card for linked tenants
- Hide sync/import buttons for tenants without mapping
- Add .tenant-badge-dt CSS for the badge

dashboard/app/[tenant]/page.tsx

@@ -2,7 +2,7 @@
 
 import { useState, useCallback, useMemo } from 'react';
 import { useParams, useRouter } from 'next/navigation';
-import { useMachines } from '@/lib/hooks';
+import { useMachines, useTenants } from '@/lib/hooks';
 import { useToast } from '@/lib/toast-context';
 import { api } from '@/lib/api';
 import { MachineList } from '@/components/MachineList';
@@ -36,7 +36,10 @@ export default function TenantDashboard() {
   const router = useRouter();
   const tenantId = params?.tenant as string;
   const { machines, isLoading, error, mutate } = useMachines(tenantId);
+  const { tenants } = useTenants();
   const { addToast } = useToast();
+  const currentTenant = tenants.find(t => t.id === tenantId);
+  const hasDigitalTwin = currentTenant?.has_digital_twin ?? false;
 
   const [showModal, setShowModal] = useState(false);
   const [form, setForm] = useState<MachineForm>(INITIAL_FORM);
@@ -270,14 +273,18 @@ export default function TenantDashboard() {
           설비 관리
         </h2>
         <div className="page-header-actions">
-          <button className={`btn-sync ${syncing ? 'sync-spinning' : ''}`} onClick={handleSync} disabled={syncing}>
-            <span className="material-symbols-outlined">sync</span>
-            동기화
-          </button>
-          <button className="btn-outline" onClick={openImportModal}>
-            <span className="material-symbols-outlined">cloud_download</span>
-            디지털 트윈에서 가져오기
-          </button>
+          {hasDigitalTwin && (
+            <>
+              <button className={`btn-sync ${syncing ? 'sync-spinning' : ''}`} onClick={handleSync} disabled={syncing}>
+                <span className="material-symbols-outlined">sync</span>
+                동기화
+              </button>
+              <button className="btn-outline" onClick={openImportModal}>
+                <span className="material-symbols-outlined">cloud_download</span>
+                디지털 트윈에서 가져오기
+              </button>
+            </>
+          )}
           <button className="btn-primary" onClick={openCreate}>
             <span className="material-symbols-outlined">add</span>
             새 설비 등록

dashboard/app/globals.css

@@ -425,6 +425,23 @@ a {
   color: var(--md-on-surface-variant);
 }
 
+.tenant-badge-dt {
+  display: inline-flex;
+  align-items: center;
+  gap: 4px;
+  margin-top: 4px;
+  padding: 3px 10px;
+  border-radius: 12px;
+  background: var(--md-primary-container);
+  color: var(--md-on-primary-container);
+  font-size: 11px;
+  font-weight: 500;
+}
+
+.tenant-badge-dt .material-symbols-outlined {
+  font-size: 14px;
+}
+
 /* ===== Login ===== */
 .login-container {
   min-height: 100vh;

dashboard/app/page.tsx

@@ -49,6 +49,12 @@ export default function HomePage() {
                   <span className="material-symbols-outlined tenant-icon">factory</span>
                   <span className="tenant-name">{tenant.name}</span>
                   <span className="tenant-id">{tenant.id}</span>
+                  {tenant.has_digital_twin && (
+                    <span className="tenant-badge-dt">
+                      <span className="material-symbols-outlined">cloud</span>
+                      디지털 트윈 연동
+                    </span>
+                  )}
                 </button>
               ))}
             </div>

dashboard/lib/types.ts

@@ -12,6 +12,7 @@ export interface Tenant {
   name: string;
   industry_type: string;
   is_active: boolean;
+  has_digital_twin: boolean;
   created_at: string | null;
 }
 

src/tenant/manager.py

@@ -44,6 +44,7 @@ async def get_tenant(db: AsyncSession, tenant_id: str) -> Dict:
         "name": str(tenant.name),
         "industry_type": str(tenant.industry_type),
         "is_active": bool(tenant.is_active),
+        "has_digital_twin": bool(tenant.digital_twin_company_id),
         "created_at": _format_timestamp(tenant.created_at),
     }
 
@@ -99,6 +100,7 @@ async def list_tenants(db: AsyncSession) -> List[Dict]:
             "name": str(t.name),
             "industry_type": str(t.industry_type),
             "is_active": bool(t.is_active),
+            "has_digital_twin": bool(t.digital_twin_company_id),
             "created_at": _format_timestamp(t.created_at),
         }
         for t in tenants