fix: 修复任务生命周期与调度就绪，优化执行和构建开销 (#3069)

* fix: harden task lifecycle and scheduler readiness

* fix: confine log writes to the configured log directory

* fix: verify complete build artifacts and untracked inputs

* fix: reconcile scheduler state and make stop win startup races

* fix: isolate cron generations and serialize scheduler recovery

back/shared/schedulerMutationLock.ts

@@ -0,0 +1,38 @@
+import lockfile from 'proper-lockfile';
+import config from '../config';
+
+// HTTP and gRPC both mutate cron definitions. Hold one shared lock from the
+// initial DB read/write through scheduler registration (including rollback).
+// Recovery takes the same lock before reading its replacement snapshot.
+export async function withSchedulerMutation<T>(
+  operation: () => Promise<T>,
+): Promise<T> {
+  let release: () => Promise<void>;
+  try {
+    release = await lockfile.lock(config.crontabFile, {
+      realpath: false,
+      lockfilePath: `${config.crontabFile}.scheduler.lock`,
+      stale: 30000,
+      update: 10000,
+      retries: { retries: 50, factor: 1, minTimeout: 100, maxTimeout: 100 },
+    });
+  } catch (cause) {
+    throw Object.assign(
+      new Error('Scheduler configuration is busy', { cause }),
+      {
+        status: 503,
+      },
+    );
+  }
+  try {
+    return await operation();
+  } finally {
+    await release();
+  }
+}
+
+export function schedulerRegistrationError(message: string, cause: any): Error {
+  return Object.assign(new Error(message, { cause }), {
+    status: cause?.status === 503 ? 503 : 500,
+  });
+}