feat: Worker 进程拆分（F20）

- 新增 worker 进程入口（npm run worker）只跑作业不监听端口
- trialrun compose 增加 worker profile（server 可 JOBS_ENABLED=false）
- 更新 runbook/.env.example/README 说明与 v3 CSV 状态推进

server/src/index.js

@@ -2,6 +2,13 @@ const { buildApp } = require("./app");
 
 async function main() {
   const app = await buildApp();
+  app.log.info(
+    {
+      jobDriver: app.config.jobDriver,
+      jobsEnabled: app.config.jobsEnabled,
+    },
+    "API process started",
+  );
 
   const { host, port } = app.config;
   await app.listen({ host, port });

server/src/worker.js

@@ -0,0 +1,46 @@
+const { buildApp } = require("./app");
+
+async function main() {
+  const app = await buildApp();
+  app.log.info(
+    {
+      jobDriver: app.config.jobDriver,
+      jobsEnabled: app.config.jobsEnabled,
+    },
+    "Worker process started",
+  );
+
+  let shuttingDown = false;
+  const shutdown = async (signal) => {
+    if (shuttingDown) return;
+    shuttingDown = true;
+
+    app.log.info({ signal }, "Worker graceful shutdown start");
+
+    const timeoutMs = 10_000;
+    const forceTimer = setTimeout(() => {
+      app.log.error({ timeoutMs }, "Worker graceful shutdown timeout, force exit");
+      process.exit(1);
+    }, timeoutMs);
+    forceTimer.unref?.();
+
+    try {
+      await app.close();
+      app.log.info("Worker graceful shutdown completed");
+      process.exit(0);
+    } catch (error) {
+      app.log.error({ err: error }, "Worker graceful shutdown failed");
+      process.exit(1);
+    }
+  };
+
+  process.on("SIGTERM", () => shutdown("SIGTERM"));
+  process.on("SIGINT", () => shutdown("SIGINT"));
+}
+
+main().catch((err) => {
+  // eslint-disable-next-line no-console
+  console.error(err);
+  process.exit(1);
+});
+