feat(server): unified scheduled-job registry and scheduler; module timers moved onto it

- modules/schedules: registerScheduledJob({key, defaults, run}) registry; defaults are
  synced into scheduled_job without overriding user-changed enabled/schedule
- scheduler runs only on the io worker, one instance via pg_try_advisory_lock held on a
  dedicated connection; due = enabled and next_run_at reached, or run requested;
  jobs run in parallel, never re-entrant; interval next = finish + period, cron next match;
  run-now does not move next_run_at and merges duplicate requests; skip advances one period;
  history trimmed to the last 50 runs; interrupted runs marked failed on takeover
- agent_check jobs: trigger condition checked first, goal template rendered, runAgent
  enqueued via startRun(trigger=schedule) with allowlist and budget, one run per time slot;
  allowRecover uses the autoInvestigate grant check; results harvested back into the run
  history and optionally reported as an info decision; 3 built-in checks, off by default
- sources-identity (feeds.poll, sites.snapshot, identity.review), acquisition-organize
  (downloads.sync, cache.threshold, downloads.orchestrate, slots.reevaluate,
  subscriptions.search, subscriptions.metadata, library.reconcile) and file-manager
  (trash.purge) register jobs instead of running their own setInterval; default
  intervals unchanged; backup registered as an unconfigured placeholder
- endpoints under /schedules (admin, console session only)

TODO: pi refreshPiTokens and auth-settings session cleanup still own their timers.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

apps/server/test/e2e/fixtures/modules.ts

@@ -5,6 +5,7 @@ import { makeTorrent } from "@umt/testkit";
 import { createAcquisitionOrganizeModule } from "../../../src/modules/acquisition-organize/index.ts";
 import { createAgentModule } from "../../../src/modules/agent/index.ts";
 import { authSettingsModule } from "../../../src/modules/auth-settings/index.ts";
+import { createSchedulesModule } from "../../../src/modules/schedules/index.ts";
 import { createSourcesIdentityModule } from "../../../src/modules/sources-identity/index.ts";
 import type { ServerModule } from "../../../src/modules/types.ts";
 
@@ -64,5 +65,7 @@ export function buildModules(o: E2EModuleOptions): ServerModule[] {
       ...(o.fakeScripts ? { fakeScripts: o.fakeScripts } : {}),
       goalPollSec: 1,
     }),
+    // 定时任务调度器(驱动上面模块登记的周期任务;须在末尾)
+    createSchedulesModule({ builtinChecks: false, scheduler: { tickMs: 100, lockRetryMs: 200 } }),
   ];
 }