fix(audit): kill fake install cmds + dead demo CTA; production fonts; scoped error boundary; admin bootstrap seed

Full-site fake-data audit findings:
- SetupWizard showed a curl|sh installer (get.corrosionmgmt.com) and a
  'corrosion-agent' binary that don't exist -> real host-agent commands
- 'View live demo' CTA on 5 marketing pages linked to a login, not a
  demo -> honest 'Sign in'
- Google Fonts @import was silently dropped from the production CSS
  bundle (mid-bundle @import) -> <link> tags in index.html; prod was
  shipping system fallback fonts
- App-root ErrorBoundary bricked the entire SPA (incl. marketing) on a
  single failed fetch until manual reload -> resets on route change +
  content-scoped boundary inside DashboardLayout so nav chrome survives
- Status page KPIs showed fake zeros while the fetch failed -> em dash
- Login lacked the forgot-password link (flow already existed end-to-end)
- AdminSeedService: fresh DB had schema but no login possible; seeds
  super-admin + license from ADMIN_* env when users table is empty

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

frontend/src/views/public/StatusPageView.vue

@@ -41,12 +41,8 @@ interface StatusResponse {
 
 const api = useApi()
 const servers = ref<ServerStatus[]>([])
-const platformHealth = ref<PlatformHealth>({
-  total_servers: 0,
-  online_servers: 0,
-  total_players: 0,
-  uptime_percent: 0,
-})
+// null until the first successful fetch — KPIs render '—', never fake zeros
+const platformHealth = ref<PlatformHealth | null>(null)
 
 const searchQuery = ref('')
 const loading = ref(true)
@@ -148,10 +144,10 @@ onUnmounted(() => {
 
     <!-- Platform KPIs -->
     <div v-if="!loading" class="sp-kpis">
-      <StatCard icon="server"       label="Total servers"   :value="String(platformHealth.total_servers)" />
-      <StatCard icon="activity"     label="Online now"       :value="String(platformHealth.online_servers)" />
-      <StatCard icon="users"        label="Total players"    :value="String(platformHealth.total_players)" />
-      <StatCard icon="trending-up"  label="Platform uptime"  :value="safeFixed(platformHealth.uptime_percent, 1)" unit="%" />
+      <StatCard icon="server"       label="Total servers"   :value="platformHealth ? String(platformHealth.total_servers) : '—'" />
+      <StatCard icon="activity"     label="Online now"       :value="platformHealth ? String(platformHealth.online_servers) : '—'" />
+      <StatCard icon="users"        label="Total players"    :value="platformHealth ? String(platformHealth.total_players) : '—'" />
+      <StatCard icon="trending-up"  label="Platform uptime"  :value="safeFixed(platformHealth?.uptime_percent ?? null, 1, '—')" unit="%" />
     </div>
 
     <!-- Body -->