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/vitest.config.ts

@@ -0,0 +1,19 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    environment: "jsdom",
+    coverage: {
+      provider: "v8",
+      include: ["src/**/*.ts", "src/**/*.tsx"],
+      exclude: ["src/types/**/*.ts", "src/main.tsx"],
+      thresholds: {
+        statements: 100,
+        branches: 100,
+        functions: 100,
+        lines: 100,
+      },
+    },
+    include: ["test/**/*.spec.ts", "test/**/*.spec.tsx"],
+  },
+});