feat: complete TASK-WP0-01 toolchain skeleton

apps/worker/package.json

@@ -0,0 +1,19 @@
+{
+  "name": "@dada/worker",
+  "version": "0.0.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "build": "tsc -p tsconfig.json",
+    "typecheck": "tsc --noEmit -p tsconfig.json"
+  },
+  "dependencies": {
+    "better-sqlite3": "13.0.1",
+    "drizzle-orm": "0.45.2"
+  },
+  "devDependencies": {
+    "@types/better-sqlite3": "7.6.13",
+    "@types/node": "24.13.3",
+    "typescript": "7.0.2"
+  }
+}

apps/worker/src/worker.ts

@@ -0,0 +1,13 @@
+import { parentPort } from "node:worker_threads";
+
+export function handleWorkerProbe(message: unknown) {
+  return message === "ping" ? "pong" : null;
+}
+
+const workerPort = parentPort;
+
+if (workerPort) {
+  workerPort.on("message", (message: unknown) => {
+    workerPort.postMessage(handleWorkerProbe(message));
+  });
+}

apps/worker/tsconfig.json

@@ -0,0 +1,12 @@
+{
+  "extends": "../../tsconfig.base.json",
+  "compilerOptions": {
+    "module": "NodeNext",
+    "moduleResolution": "NodeNext",
+    "lib": ["ES2024"],
+    "types": ["node"],
+    "outDir": "dist",
+    "rootDir": "src"
+  },
+  "include": ["src"]
+}