chore: scaffolding mono-package jalon 1 (APT)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

vitest.config.ts

@@ -0,0 +1,10 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  test: {
+    globals: true,
+    include: ["server/**/*.test.ts", "shared/**/*.test.ts"],
+    environment: "node",
+  },
+  resolve: { alias: { "@shared": new URL("./shared", import.meta.url).pathname } },
+});