feat: add task workflow and asset downloads

scripts/worker.mjs

@@ -0,0 +1,46 @@
+#!/usr/bin/env node
+
+const baseUrl = (process.env.ZHINIAN_WORKER_BASE_URL || process.env.NEXT_PUBLIC_APP_URL || "http://127.0.0.1:3000").replace(/\/$/, "");
+const token = process.env.ZHINIAN_INTERNAL_WORKER_TOKEN || "";
+const intervalMs = positiveInt(process.env.ZHINIAN_WORKER_INTERVAL_MS, 5000);
+const limit = positiveInt(process.env.ZHINIAN_WORKER_BATCH_SIZE, 3);
+const once = process.argv.includes("--once");
+const workerId = process.env.ZHINIAN_WORKER_ID || `worker-${Math.random().toString(16).slice(2)}`;
+
+async function tick() {
+  const response = await fetch(`${baseUrl}/api/internal/worker/tick`, {
+    method: "POST",
+    headers: {
+      "Content-Type": "application/json",
+      ...(token ? { "X-Zhinian-Worker-Token": token } : {})
+    },
+    body: JSON.stringify({ workerId, limit })
+  });
+  const text = await response.text();
+  if (!response.ok) throw new Error(`Worker tick failed: ${response.status} ${text}`);
+  return text ? JSON.parse(text) : {};
+}
+
+async function run() {
+  do {
+    try {
+      const result = await tick();
+      console.log(`[zhinian-worker] claimed=${result.claimed || 0} worker=${result.workerId || workerId}`);
+    } catch (error) {
+      console.error(`[zhinian-worker] ${error instanceof Error ? error.message : String(error)}`);
+      if (once) process.exitCode = 1;
+    }
+    if (!once) await sleep(intervalMs);
+  } while (!once);
+}
+
+function positiveInt(value, fallback) {
+  const parsed = Number(value);
+  return Number.isFinite(parsed) && parsed > 0 ? Math.floor(parsed) : fallback;
+}
+
+function sleep(ms) {
+  return new Promise((resolve) => setTimeout(resolve, ms));
+}
+
+run();