feat: initial elysium idle game prototype

Sets up the full monorepo with pnpm workspaces. Includes shared types
package, Hono API with Discord OAuth/JWT auth, Prisma v6 + MongoDB
Atlas, and React + Vite frontend with game loop, five tabs, and
Discord-linked save/load.

apps/web/src/components/ui/ResourceBar.tsx

@@ -0,0 +1,49 @@
+import type { Resource } from "@elysium/types";
+
+interface ResourceBarProps {
+  resources: Resource;
+  prestigeCount: number;
+}
+
+const formatNumber = (value: number): string => {
+  if (value >= 1_000_000_000) {
+    return `${(value / 1_000_000_000).toFixed(2)}B`;
+  }
+  if (value >= 1_000_000) {
+    return `${(value / 1_000_000).toFixed(2)}M`;
+  }
+  if (value >= 1_000) {
+    return `${(value / 1_000).toFixed(2)}K`;
+  }
+  return value.toFixed(1);
+};
+
+export const ResourceBar = ({ resources, prestigeCount }: ResourceBarProps): React.JSX.Element => (
+  <header className="resource-bar">
+    <div className="resource">
+      <span className="resource-icon">🪙</span>
+      <span className="resource-value">{formatNumber(resources.gold)}</span>
+      <span className="resource-label">Gold</span>
+    </div>
+    <div className="resource">
+      <span className="resource-icon">✨</span>
+      <span className="resource-value">{formatNumber(resources.essence)}</span>
+      <span className="resource-label">Essence</span>
+    </div>
+    <div className="resource">
+      <span className="resource-icon">💎</span>
+      <span className="resource-value">{formatNumber(resources.crystals)}</span>
+      <span className="resource-label">Crystals</span>
+    </div>
+    <div className="resource">
+      <span className="resource-icon">🔮</span>
+      <span className="resource-value">{formatNumber(resources.runestones)}</span>
+      <span className="resource-label">Runestones</span>
+    </div>
+    {prestigeCount > 0 && (
+      <div className="prestige-badge">
+        ⭐ Prestige {prestigeCount}
+      </div>
+    )}
+  </header>
+);