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/components/Layout.tsx

@@ -4,7 +4,7 @@ import {
   Sidebar,
   TopBar,
 } from '@cameleer/design-system';
-import { LayoutDashboard, ShieldCheck, Users, Settings, Shield, Building, ScrollText, Mail, BarChart3, Server, ExternalLink } from 'lucide-react';
+import { LayoutDashboard, ShieldCheck, Users, Settings, Shield, Building, ScrollText, Mail, BarChart3, Server, ExternalLink, Key } from 'lucide-react';
 import { useQuery } from '@tanstack/react-query';
 import { useAuth } from '../auth/useAuth';
 import { useScopes } from '../auth/useScopes';
@@ -139,6 +139,15 @@ export function Layout() {
             <Mail size={12} style={{ marginRight: 6, verticalAlign: -1 }} />
             Email Connector
           </div>
+          <div
+            style={{ padding: '6px 12px 6px 36px', fontSize: 13, cursor: 'pointer',
+              fontWeight: isActive(location, '/vendor/license-tools') ? 600 : 400,
+              color: isActive(location, '/vendor/license-tools') ? 'var(--amber)' : 'var(--text-muted)' }}
+            onClick={() => navigate('/vendor/license-tools')}
+          >
+            <Key size={12} style={{ marginRight: 6, verticalAlign: -1 }} />
+            License Tools
+          </div>
           <div
             style={{ padding: '6px 12px 6px 36px', fontSize: 13, cursor: 'pointer', color: 'var(--text-muted)' }}
             onClick={() => window.open(`${window.location.protocol}//${window.location.hostname}:3002`, '_blank', 'noopener')}