feat(marketing): pricing, how-it-works, FAQ, roadmap, early-access pages (real content)

Five marketing sub-pages built to match the landing's design language, all real content: Pricing (4 real tiers + Fleet Block + commercial-use definition + feature-comparison table + self-service support model), How it works (one agent -> N game instances, BYOS, no-SSH), FAQ (real support/product/games/billing Q&A reflecting the self-service model), Roadmap (honest Shipped/In-progress/Planned, no fake dates), Early access (real signup form). 3 icons added (circle/send/help-circle). Visually verified via Playwright; 0 console errors. Build green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/components/ds/core/Icon.vue

@@ -25,6 +25,7 @@ import {
   Pencil, Save, ShoppingBag, Target, User,
   // Marketing site additions
   Route, Timer, Megaphone, DatabaseBackup, Store, Undo2,
+  Circle, Send, HelpCircle,
 } from 'lucide-vue-next'
 
 const props = withDefaults(
@@ -63,6 +64,7 @@ const registry: Record<string, Component> = {
   // Marketing site additions
   route: Route, timer: Timer, megaphone: Megaphone,
   'database-backup': DatabaseBackup, store: Store, 'undo-2': Undo2,
+  circle: Circle, send: Send, 'help-circle': HelpCircle,
 }
 
 const cmp = computed<Component | null>(() => registry[props.name] ?? null)