feat(ui): add license minting form, verify tool, and update all pages

Vendor UI:
- TenantDetailPage: full minting form with tier presets, 13 configurable
  limits, expiry/grace period, label. Mint & Push or Mint & Copy actions.
  License bundle display with all three env vars for standalone deployment.
- LicenseVerifyPage: paste token to decode + validate signature, shows
  envelope details and state badge. Public key viewer with copy button.
- Layout: added "License Tools" nav item under Vendor section.
- vendor-hooks: useMintLicense, useLicensePresets, useVerifyLicense, usePublicKey

Tenant UI:
- TenantLicensePage: replaced features card with full 13-key limits display,
  added grace period and label fields
- TenantDashboardPage: fixed limit keys (agents→max_agents, environments→max_environments)

Common:
- Updated types (dropped features, added label/gracePeriodDays/bundle types)
- Updated tier colors for STARTER/TEAM/BUSINESS/ENTERPRISE
- Updated CreateTenantPage tier dropdown

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ui/src/router.tsx

@@ -17,6 +17,7 @@ import { CertificatesPage } from './pages/vendor/CertificatesPage';
 import { InfrastructurePage } from './pages/vendor/InfrastructurePage';
 import { VendorMetricsPage } from './pages/vendor/VendorMetricsPage';
 import { EmailConfigPage } from './pages/vendor/EmailConfigPage';
+import { LicenseVerifyPage } from './pages/vendor/LicenseVerifyPage';
 import { TenantDashboardPage } from './pages/tenant/TenantDashboardPage';
 import { TenantLicensePage } from './pages/tenant/TenantLicensePage';
 import { SsoPage } from './pages/tenant/SsoPage';
@@ -108,6 +109,11 @@ export function AppRouter() {
                 <EmailConfigPage />
               </RequireScope>
             } />
+            <Route path="/vendor/license-tools" element={
+              <RequireScope scope="platform:admin" fallback={<Navigate to="/tenant" replace />}>
+                <LicenseVerifyPage />
+              </RequireScope>
+            } />
 
             {/* Tenant portal */}
             <Route path="/tenant" element={<TenantDashboardPage />} />