feat(cron): daily sync.source_doc enqueue

node-cron schedules runSync at 03:00 local time; runSync enqueues
sync.source_doc for every source_docs row with sync_source='url'.
Started from server.js's CLI gate alongside the job queue.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

lib/cron/sync_source_docs.js

@@ -0,0 +1,12 @@
+import { pool } from '../db/pool.js';
+import * as queue from '../jobs/queue.js';
+
+export async function runSync() {
+  const { rows } = await pool.query(
+    `SELECT id FROM source_docs WHERE sync_source = 'url'`
+  );
+  for (const r of rows) {
+    await queue.enqueue('sync.source_doc', { source_doc_id: r.id });
+  }
+  return rows.length;
+}