feat: vendor console — tenant list, create wizard, detail page

Implements Task 9: shared components (ServerStatusBadge, UsageIndicator,
platform.module.css, tierColor utility) and full vendor console pages
(VendorTenantsPage, CreateTenantPage, TenantDetailPage). Build passes cleanly.

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

ui/src/components/ServerStatusBadge.tsx

@@ -0,0 +1,17 @@
+import { Badge } from '@cameleer/design-system';
+
+interface Props {
+  state: string;
+}
+
+const config: Record<string, { color: 'success' | 'error' | 'warning' | 'auto'; label: string }> = {
+  RUNNING: { color: 'success', label: 'Running' },
+  STOPPED: { color: 'error', label: 'Stopped' },
+  NOT_FOUND: { color: 'auto', label: 'No Server' },
+  ERROR: { color: 'error', label: 'Error' },
+};
+
+export function ServerStatusBadge({ state }: Props) {
+  const c = config[state] ?? { color: 'auto' as const, label: state };
+  return <Badge color={c.color} label={c.label} />;
+}