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/api/package.json

@@ -0,0 +1,31 @@
+{
+  "name": "@elysium/api",
+  "version": "1.0.0",
+  "private": true,
+  "type": "module",
+  "main": "./prod/src/index.js",
+  "scripts": {
+    "build": "prisma generate && tsc -p tsconfig.json",
+    "db:push": "prisma db push",
+    "dev": "op run --env-file=./prod.env -- tsx watch src/index.ts",
+    "lint": "eslint --max-warnings 0 src",
+    "start": "op run --env-file=./prod.env -- node prod/src/index.js",
+    "test": "vitest run --coverage"
+  },
+  "dependencies": {
+    "@elysium/types": "workspace:*",
+    "@hono/node-server": "1.13.7",
+    "@prisma/client": "6.5.0",
+    "hono": "4.7.4",
+    "prisma": "6.5.0"
+  },
+  "devDependencies": {
+    "@nhcarrigan/eslint-config": "5.2.0",
+    "@nhcarrigan/typescript-config": "4.0.0",
+    "@vitest/coverage-v8": "3.0.8",
+    "eslint": "9.22.0",
+    "tsx": "4.19.3",
+    "typescript": "5.8.2",
+    "vitest": "3.0.8"
+  }
+}