fix(worker): worker_ready geo-resume blocked by early return in kn-resume

Root cause of "auto-resume never fired": the kn_scrape_runs resume section
hit `if not rows: return` (and similar `return` in except) before reaching
the nspd_geo_jobs resume section. Whenever there were no zombie kn-runs
(the normal case), the handler bailed out and geo jobs stayed forever
'running' with stale heartbeats — users had to manual cancel/resume after
every deploy.

Fix: don't return early. Initialize `ids = []`, only run UPDATE if rows
exist, drop the inner `return` from exception branch. The for-loop over
ids becomes a no-op when empty, and execution falls through to the geo
section. Same pattern as the breadcrumb above — fail soft, continue.

cleanup_zombies beat task (added in caa467f) stays as belt-and-suspenders
in case worker_ready signal ever misbehaves again.

backend/app/workers/celery_app.py

@@ -279,7 +279,9 @@ def _resume_zombie_runs(sender=None, **_kwargs) -> None:
 
     from app.core.db import SessionLocal
 
+    # ── kn_scrape_runs resume ──
     db = SessionLocal()
+    ids: list[int] = []
     try:
         rows = (
             db.execute(
@@ -297,34 +299,32 @@ def _resume_zombie_runs(sender=None, **_kwargs) -> None:
             .mappings()
             .all()
         )
-        if not rows:
-            logger.info("worker_ready: нет stale runs для resume")
-            return
-
-        ids = [int(r["run_id"]) for r in rows]
-        # Помечаем найденные как 'zombie' одним апдейтом — resume создаст новые
-        # run_id со ссылкой resumed_from_run_id.
-        db.execute(
-            text(
-                """
-                UPDATE kn_scrape_runs
-                   SET status = 'zombie',
-                       finished_at = NOW(),
-                       error = COALESCE(error,
-                           'auto-zombie at worker_ready, resume scheduled')
-                 WHERE run_id = ANY(:ids)
-                """
-            ),
-            {"ids": ids},
-        )
-        db.commit()
+        if rows:
+            ids = [int(r["run_id"]) for r in rows]
+            # Помечаем найденные как 'zombie' одним апдейтом — resume создаст новые
+            # run_id со ссылкой resumed_from_run_id.
+            db.execute(
+                text(
+                    """
+                    UPDATE kn_scrape_runs
+                       SET status = 'zombie',
+                           finished_at = NOW(),
+                           error = COALESCE(error,
+                               'auto-zombie at worker_ready, resume scheduled')
+                     WHERE run_id = ANY(:ids)
+                    """
+                ),
+                {"ids": ids},
+            )
+            db.commit()
+        else:
+            logger.info("worker_ready: нет stale kn runs для resume")
     except Exception as e:
-        logger.exception("worker_ready resume scan failed: %s", e)
+        logger.exception("worker_ready kn resume scan failed: %s", e)
         try:
             db.rollback()
         except Exception:
             pass
-        return
     finally:
         db.close()