Overhaul infrastructure: replace GPU model with rack-centric system

Replace flat GPU buying with a realistic data center + rack pipeline:
- 4 DC tiers (small/medium/large/mega) with construction time, dual
  capacity constraints (rack slots + power budget kW), and era/research
  gating
- 10 predefined rack SKUs from consumer GPUs through custom ASICs, each
  with unique FLOPS, power draw, cost, and pipeline timings
- 6-stage procurement pipeline (order → mfg → receive → install → test
  → production) with Kanban UI, talent-influenced speed bonuses
- Test failures (5-25% base rate) reduced by cooling, ops talent, and QA
  research; auto-repair with cost and re-test cycle
- Production failures at low per-tick rate, racks sent to repair pipeline
- Cooling and redundancy upgrades per DC (reduce failure rates)
- 4 new tech tree nodes (DC Engineering II/III/IV, Quality Assurance)
- Save version bump (1→2) with migration that resets old saves
- Updated economy system to account for rack repair costs
- Redesigned Infrastructure page with pipeline Kanban, capacity bars,
  rack ordering, and DC upgrade panels

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

apps/web/src/components/game/CompanyStatsCard.tsx

@@ -20,6 +20,7 @@ export function CompanyStatsCard({ onClose }: { onClose: () => void }) {
   const reputation = useGameStore((s) => s.reputation.score);
   const achievements = useGameStore((s) => s.achievements.unlocked.length);
   const dataCenters = useGameStore((s) => s.infrastructure.dataCenters.length);
+  const totalRacks = useGameStore((s) => s.infrastructure.totalRackCount);
 
   const eraLabel = era === 'startup' ? 'Startup' : era === 'scaleup' ? 'Scale-up' : era === 'bigtech' ? 'Big Tech' : 'AGI';
   const hours = Math.floor(totalPlayTime / 3600);
@@ -32,7 +33,7 @@ export function CompanyStatsCard({ onClose }: { onClose: () => void }) {
     `Valuation: ${formatMoney(valuation)}`,
     `Subscribers: ${formatNumber(subscribers)} | Models: ${models}`,
     `Best Model: ${bestModel.toFixed(1)}/100 | Reputation: ${reputation}/100`,
-    `Data Centers: ${dataCenters} | Achievements: ${achievements}/${ACHIEVEMENT_DEFINITIONS.length}`,
+    `Data Centers: ${dataCenters} | Racks: ${totalRacks} | Achievements: ${achievements}/${ACHIEVEMENT_DEFINITIONS.length}`,
   ].join('\n');
 
   const handleCopy = () => {