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.

packages/types/package.json

@@ -0,0 +1,18 @@
+{
+  "name": "@elysium/types",
+  "version": "1.0.0",
+  "private": true,
+  "main": "./prod/src/index.js",
+  "types": "./prod/src/index.d.ts",
+  "scripts": {
+    "build": "tsc -p tsconfig.json",
+    "lint": "eslint --max-warnings 0 src",
+    "test": "echo \"No tests for types package\""
+  },
+  "devDependencies": {
+    "@nhcarrigan/eslint-config": "5.2.0",
+    "@nhcarrigan/typescript-config": "4.0.0",
+    "eslint": "9.22.0",
+    "typescript": "5.8.2"
+  }
+}