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.

package.json

@@ -0,0 +1,15 @@
+{
+  "name": "elysium",
+  "version": "1.0.0",
+  "private": true,
+  "scripts": {
+    "lint": "pnpm -r lint",
+    "build": "pnpm -r build",
+    "test": "pnpm -r test",
+    "dev": "pnpm -r --parallel dev"
+  },
+  "devDependencies": {
+    "@nhcarrigan/typescript-config": "4.0.0",
+    "typescript": "5.8.2"
+  }
+}