fix(tenancy): add CRUD actions to merchant-users page, fix view URL and icon

- Fix View link to point to /admin/merchant-users/{id} instead of
  /admin/admin-users/{id}
- Add toggle status and delete action buttons to list page
- Add merchant-user detail page with route, template, and JS
- Replace non-existent "briefcase" icon with "office-building"

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

app/modules/tenancy/services/tenancy_metrics.py

@@ -374,7 +374,7 @@ class TenancyMetricsProvider:
                     value=merchant_owners,
                     label="Merchant Owners",
                     category="tenancy",
-                    icon="briefcase",
+                    icon="office-building",
                     description="Distinct merchant owners",
                 ),
                 MetricValue(